2016年1月31日 星期日

MWC 922: The Red Square Nebula


What could cause a nebula to appear square? No one is quite sure. The hot star system known as MWC 922, however, appears to be embedded in a nebula with just such a shape. The featured image combines infrared exposures from the Hale Telescope on Mt. Palomar in California, and the Keck-2 Telescope on Mauna Kea in Hawaii. A leading progenitor hypothesis for the square nebula is that the central star or stars somehow expelled cones of gas during a late developmental stage. For MWC 922, these cones happen to incorporate nearly right angles and be visible from the sides. Supporting evidence for the cone hypothesis includes radial spokes in the image that might run along the cone walls. Researchers speculate that the cones viewed from another angle would appear similar to the gigantic rings of supernova 1987A, possibly indicating that a star in MWC 922 might one day itself explode in a similar supernova. via NASA http://ift.tt/1TuXUo7

Did Someone Hack NASA's Evil Drones?

Hackers Allegedly Hijack Drone After Massive Breach at NASA, Inforwars "The collection of files, provided to Infowars by AnonSec admin Dêfãult Vírüsa prior to being made public Sunday, include 631 videos from aircraft and weather radars, 2,143 flight logs as...

from NASA Watch http://ift.tt/1nxPz6y
via IFTTT

Take The NASA LaRC RD Promotion Process Survey

RD Promotion Process Survey (Jan 2016), LaRC Survey at Surveymonkey "The RD Promotion Process Team is evaluating the efficiency and transparency of the promotion process for AST's and technicians in RD. The top-level goals of this team are to evaluate...

from NASA Watch http://ift.tt/1PrsxJw
via IFTTT

Is Space Commerce About to Become Real Commerce?

Why investors are following Musk, Bezos in betting on the stars, Washington Post "The new space investors are catching up with the slow, but growing development of the commercial space sector, which NASA has been fostering for years. With the...

from NASA Watch http://ift.tt/1KPK096
via IFTTT

SPECTACULAR Photos of a Rocket Re-Entering Over Hawaii!

Around 2:00 a.m. local time on Saturday, Jan. 30, 2016, astrophotographer Steve Cullen was driving home from visiting the summit of Mauna Kea on the Big Island of Hawaii. He stopped at around 11,000 feet to take some panorama shots of the peak… but what he got was much more.

He noticed an orange light heading up into the sky out of the west. It was moving across the sky at about the speed you’d expect from a satellite, but at that time of night no satellite moving at that rate would be lit by the Sun, so it wouldn’t be visible.

Within seconds, though, it became clear what he was seeing: some sort of human-made space debris re-entering Earth’s atmosphere. How?

Because this. Check. This. OUT.

HOLY WOW! What a shot! (Click the photos for bigger, higher-resolution versions on Cullen's Facebook page.) Over the foreground of volcanic rock and more distant clouds (seen from above at that elevation), the debris came streaking toward the east, seeming bursting forth from the constellation of Orion (can you see it behind the trails?).

It turns out this was almost certainly the remains of a Chinese Long March rocket body, predicted to burn up over that area at around that time:

The rocket launched on Sep. 12, 2015, carrying a very secret satellite of some kind. Once the satellite is in orbit the rocket is no longer needed, so it’s allowed to burn up as it falls back to Earth. Doing so over the enormous Pacific Ocean minimizes the risk of debris doing any damage once it’s down.

As the rocket rams through Earth’s air, it compresses the atmospheric gas violently. A compressed gas heats up, and this is so powerful during re-entry that the heat is enough to vaporize the debris. It falls apart, each piece leaving a long trail of ionized metal and gas behind it that can glow for quite some time. They fall together, moving across the sky as a unit, though they separate over time as drag affects each piece separately.

A few minutes later, the pieces started to set in the west.

As the pieces move farther away, perspective makes it look like the trails are converging. This is the same effect that makes rays coming from sun set appear to diverge as they move away from the Sun, and sometimes converge on the other side of the sky.

Finally, once they were gone, all that was left was the bits of glowing particles, literally twisting in the wind dozens of kilometers above the Earth.

I can’t get over how amazing these photos are. I’ve seen lots of cool re-entry photos, but I think these very well might be the very best. 

Mind you, Cullen happened to stop because he wanted to take a few more photos, and did so at just the right time to see this incredible event. Do I even need to say it?

Keep looking up! You never know what you might see.



from Bad Astronomy http://ift.tt/1Q3BFQP
via IFTTT

2016年1月30日 星期六

A Five Planet Dawn


As January closes and in the coming days of February, early morning risers can spot the five naked-eye planets before dawn. Though some might claim to see six planets, in this seaside panoramic view all five celestial wanderers were found above the horizon along with a bright waning gibbous Moon on January 27. Nearly aligned along the plane of the ecliptic, but not along a line with the Sun, the five planets are spread well over 100 degrees across the sky. Just arriving on the predawn scene, fleeting Mercury stands above the southeastern horizon in the golden light of the approaching sunrise. via NASA http://ift.tt/1Vxf42Y

Crash Course Astronomy: Outtakes 5

The final episode of Crash Course Astronomy went up last week, but if you miss it already, we have one final video for you: the fifth outtakes reel, which basically features me trying to pronounce common words as if I have a mouthful of oatmeal.

That bit near the end, where I seem way more upset about messing up thanking people than it calls for? That’s because it took a ridiculous number of takes to get that bit right. I lost count. Maybe 20? More? Mind you, this was literally the very last thing we were recording. Ever. We were wrapping up a long day of being in the studio, I had just finished the content for the final episode, and all I had to do was thank the fantastic folks who put CCA together. And I kept flubbing it. It was really frustrating. Over 46 episodes, that was easily the most failures I had getting the lines out. 

But I did (eventually), and we wrapped the series. So again, thanks to Nicole Sweeney and Nick Jenkins for making me look like a dork. If you want more, Outtakes One, Two, Three, and Four exist as well.

By the way, the entire CCA series is now online. When you’re done binging whatever’s on Netflix, give this one a shot. The whole Universe is waiting for you.



from Bad Astronomy http://ift.tt/23zUhBI
via IFTTT

2016年1月29日 星期五

Hidden Galaxy IC 342


Similar in size to large, bright spiral galaxies in our neighborhood, IC 342 is a mere 10 million light-years distant in the long-necked, northern constellation Camelopardalis. A sprawling island universe, IC 342 would otherwise be a prominent galaxy in our night sky, but it is hidden from clear view and only glimpsed through the veil of stars, gas and dust clouds along the plane of our own Milky Way galaxy. Even though IC 342's light is dimmed by intervening cosmic clouds, this deep telescopic image traces the galaxy's obscuring dust, blue star clusters, and glowing pink star forming regions along spiral arms that wind far from the galaxy's core. IC 342 may have undergone a recent burst of star formation activity and is close enough to have gravitationally influenced the evolution of the local group of galaxies and the Milky Way. via NASA http://ift.tt/1nCJE0C

First Look: Newest LightSail Spacecraft Unfurls Solar Sails

The Planetary Society's LightSail spacecraft successfully deployed its solar sails Thursday, wrapping up an initial round of system-level tests to prepare the CubeSat for flight.

from Planetary Society Blog http://ift.tt/1ntNhVY
via IFTTT

Media Accreditation Open for Next Commercial Space Station Cargo Mission

NASA has opened media accreditation for the next launch of a commercial resupply mission to the International Space Station. The launch of Orbital ATK’s Cygnus spacecraft is scheduled for Thursday, March 10, during a 30-minute window that opens at approximately 3 a.m. EST.

January 29, 2016
from NASA http://ift.tt/1P2M9Qv
via IFTTT

Inspiration Endures

My Aunt, Judy Resnik, by Jenna Resnik "You can shape your destiny and create your future, if only you try. Go find your 'other world', and remember that if you shoot for the moon, even if you miss, you'll land...

from NASA Watch http://ift.tt/1SeG3CZ
via IFTTT

What's up in solar system exploration: February 2016 edition

What's going on with our robotic planetary missions? In February I count more than 20 planetary spacecraft exploring six targets beyond Earth or cruising to new destinations.

from Planetary Society Blog http://ift.tt/1QLyqSK
via IFTTT

Curiosity Self-Portrait at Martian Sand Dune


This self-portrait of NASA's Curiosity Mars rover shows the vehicle at "Namib Dune," where the rover's activities included scuffing into the dune with a wheel and scooping samples of sand for laboratory analysis. via NASA http://ift.tt/1PK1POl

NASA Television to Air Russian Spacewalk

NASA Television will broadcast live coverage of a 5.5-hour spacewalk by two Russian cosmonauts aboard the International Space Station beginning at 7:30 a.m. EST Wednesday, Feb. 3.

January 29, 2016
from NASA http://ift.tt/23y2nea
via IFTTT

By the Light of the Zodiac

Given how much time I’ve spent outside at night looking up, it’s funny to think there are still quite a few phenomena I’ve never seen. One that’s very near the top of my list of “Must See” things is zodiacal light.

This is the glow of dust and particles shed by comets, ones that orbit the Sun on relatively short paths. Over time these objects are influenced by the gravity of Jupiter, so we call them Jupiter-family comets. Made of ice and rock, they shed this material as the Sun warms them. Eventually, this stuff suffuses through the inner solar system, sticking pretty close to the same orbital planes as the planets, forming a flattish disk.

From Earth, we see the material reflecting sunlight back to us, glowing in a band across the sky. The photo above, taken at Mauna Kea by Rogelio Bernal Andreo, is one of the best shots I’ve seen of zodiacal light. It’s very faint, so you need dark skies — which the volcano provides (I think the faint streak across the middle is from a satellite).

Now follow along here: The planets, including the Earth, orbit the Sun on pretty much the same plane (from the side, the solar system’s planets’ orbits look flat). From the Earth, it looks like the Sun moves around us once per year. The path it takes across the sky is the same year after year, and we call this the ecliptic. The planets all move across the sky in that same path, too.

So, like clockwork, the Sun passes into the same constellations at a certain time every year. You know the names of these constellations: Sagittarius, Libra, Scorpius, Aries, Gemini… the constellation of the zodiac, or, if you prefer, the zodiacal constellations.

Since the glow we see from the cometary dust is also in this same plane, it too sticks to the same constellations, and we therefore call it zodiacal light. How cool is that? Cool enough that after a few years spending time in some rock band, a guitarist decided to go back and get his PhD studying it.

Interestingly, the dust we see is not constant. Solar wind, interactions with Jupiter, and other effects would eventually blow it all away. It’s replenished by more comets coming in and renewing it. I found a paper describing this, and the astronomers found that the amount of dust injected into the cloud must be around 100,000 kg per second. That’s a stunning three billion tons per year!

Mind you, that’s spread out over a lot of volume. Like, trillions of cubic kilometers at least. So it’s pretty thin stuff… but thick enough to be seen, at least from Earth on a dark, Moonless night, and photographed so that we humans can gaze upon it in awe and wonder about the marvelous working of our solar system. That’s a pretty good deal for us, I think.



from Bad Astronomy http://ift.tt/1PJFqjX
via IFTTT

ISS Daily Summary Report – 01/28/16

Story Time from Space:  Peake read “Science on the Space Station” from the book Max Goes to the Space Station,” discussed the subject on camera and demonstrated the scientific principles involved.  Kelly obtained pictures of Peake while he was reading the book with the Cupola in the background.  The video recording will be downlinked to the ground and used for educational purposes.   Sleep Actiwatch Downlink and Configuration:  Kelly downloaded data from his and Kornienko’s Actiwatch Spectrums and then configured the devices to continue collecting data.  The actiwatches have a photodiode that measures ambient light and an accelerometer to measure the movement of the arm or leg that the watch is attached to.  The actiwatch data recorded on the watch supports the Sleep ISS-12 experiment, which assesses the effects of space flight and ambient light exposure on sleep during a year-long mission on the ISS.   Low Earth Orbiting Navigation Experiment for Spacecraft Testing Autonomous Rendezvous and Docking (LONESTAR):  Peake depressurized and vented the JEM Airlock today in preparation for the deploy of the LONESTAR tomorrow.  LONESTAR contains satellites AggieSat4 (built by Texas A&M University students) and Bevo-2 (built by University of Texas students).  After deploy away from the ISS, AggieSat4 ejects the BEVO-2 satellite.  Both satellites then perform cross-linking communications, exchange data, link to GPS, and transmit to ground radio stations.  LONESTAR is used to further develop and refines autonomous navigation, rendezvous and docking software and procedures.  Future NASA missions to destinations such as asteroids and other celestial bodies require the use of autonomous navigation systems.   Orbital ATK (OA)-4 Cargo Operations:  All three USOS Crew continued transferring Cygnus cargo to ISS today. As of yesterday afternoon, approximately 17 hours remain to be completed.  Cygnus is scheduled to unberth from ISS on February 19th.   Japanese Experiment Module (JEM) Internal Port Camera:  Peake worked to relocate the JEM internal port camera slightly lower from its current position over the JEM Airlock. The new position will avoid interference with upcoming Stowage Frame installation.   Power Strip (PS)-120 Junction Box Installation:  Peak has installed a PS-120 Junction Box within the JEM today. Once installed, he changed the power source for the Freezer-Refrigerator Of STirling cycle (FROST) from Utility Outlet Panel (UOP) to the newly installed junction box.   Sound Level Measurements and Acoustic Blanket:  Kopra configured and checked out a new Sound Level Meter, then obtained sound level measurements in Node 3.  There was not sufficient time to complete the Acoustic Blanket installation today, therefore the activity will be deferred to an alternate day.  The two Acoustic Blankets that were to be installed today were intended to reduce the noise coming from Treadmill 2 (T2), especially near the runner’s head.     Today’s Planned Activities All activities were completed unless otherwise noted. JEM System Laptop Terminal Reboot WRS Water Sample Analysis JEMAL – Depress and Vent WRM. Condensate Pumping Initiation RGN – recycle tank drain into EDV EVA Medical Kit Configuration Brine and urine transfer from EDV-U to Progress 429 (SM Aft) Rodnik H2O Tank and Flushing Connector JPM – Internal camera relocation Photo/TV Battery Charge Initiation Scheduled Maintenance of Compound Specific Analyzer- Combustion Products (CSA-CP) Checkout of BETA-08 Data Output Device (УСИ) using Gamma-1M Equipment WRM.  Terminate Condensate Pumping Health Maintenance System (HMS) – Food Frequency Questionnaire Telemetry checkout of Orlan systems, Orlan interface unit (БСС), comm, and biomed parameters JEM – Installation of PS-120 Junction Box Comm reconfig into initial after Orlan Comm. Check Specific EVA Procedures Study Cygnus Cargo Operations DC1 EV hatch1 pusher checkout JEMAL – Verifying depressurization complete ESA Weekly Crew Conference JEM Airlock Depressurization and Vent Confirmation Story Time (ST) – Photography Photo/Video Equipment Battery Changeout TOCA Data Recording ALGOMETRIA. Search and stowage of TTA-Data No.05 data storage device Cygnus Cargo Operations IMS and Stowage Conference Checkout of Sound Level Meter SLEEP – Configuration and data download Sound level measurements СОЖ Maintenance IMS Delta File Prep Preventive Maintenance of FS1 Laptop (Cleaning and rebooting) BRI Monthly Maintenance Cygnus Cargo Operations SLM Acoustic Blanket Install [Deferred] Preventive Maintenance of SM АСП-О Hatch Sealing Mechanism and Progress 429 [АСА] Hatch door (SM Aft) before RS EVA Progress 429 (SM Aft) Activation, Air Duct Removal Removal of ССВП Screw Clamps from SM Aft and MPEG2 Video Recording of SM Aft – Progress 429 interface.Video downlink via OCA ALGOMETRIA. Experiment Ops SM Aft – Progress 429 Hatch Closure ПрК-СУ and СУ – ТГК 429 (SM Aft) Hatch Leak Check SLM Data Transfer Warning/Emergency Book Deployment Health Maintenance System (HMS) – Food Frequency Questionnaire INTERACTION-2. Experiment Ops Cygnus – Cargo Operations Tagup Terminate Photo/Video Battery Charge JRNL – Journal Entry COGNITION – Experiment Ops and Filling Questionnaire   Completed Task List Items None   Ground Activities All activities were completed unless otherwise noted. Nominal System Commanding   Three-Day Look Ahead: Friday, 01/29: Cygnus Cargo Transfer, BASS-M Ops, Lonestar Deploy, Kelly Day Off Saturday, 01/30: Crew Day Off, Weekly Cleaning Sunday, 01/31:  Crew Day Off   QUICK ISS Status – Environmental Control Group:                               Component Status Elektron On Vozdukh Manual [СКВ] 1 – SM Air Conditioner System (“SKV1”) Off [СКВ] 2 – SM Air Conditioner System (“SKV2”) On Carbon Dioxide Removal Assembly (CDRA) Lab Operate Carbon Dioxide Removal Assembly (CDRA) Node 3 Override Major Constituent Analyzer (MCA) Lab Idle Major Constituent Analyzer (MCA) Node 3 Operate Oxygen Generation Assembly (OGA) Process Urine Processing Assembly (UPA) Standby Trace Contaminant Control System (TCCS) Lab Full Up Trace Contaminant Control System (TCCS) Node 3 Off  

January 29, 2016 at 12:26AM
from NASA http://ift.tt/1QKk3xV
via IFTTT

2016年1月28日 星期四

Elliptical M60, Spiral NGC 4647


Giant elliptical galaxy M60 and spiral galaxy NGC 4647 do look like an odd couple in this sharp cosmic portrait from the Hubble Space Telescope. But they are found in a region of space where galaxies tend to gather, on the eastern side of the nearby Virgo Galaxy Cluster. About 54 million light-years distant, bright M60's simpler egg-like shape is created by its randomly swarming older stars, while NGC 4647's young blue stars, gas and dust are organized into winding arms rotating in a flattened disk. Spiral NGC 4647 is estimated to be more distant than M60, some 63 million light-years away. Also known as Arp 116, the pair of galaxies may be on the verge of a significant gravitational encounter, though. M60 (aka NGC 4649) is about 120,000 light-years across. The smaller NGC 4647 spans around 90,000 light-years, about the size of our own Milky Way. via NASA http://ift.tt/1ZVsRBG

The Truth Is Not Out There: Goofy Flat Earth Rap War

NASA isn't going to touch B.o.B.'s flat-Earth rant, Washington Post . "Here's the anthology of the bizarre-o flap: The rapper began sharing images and whack-job conspiracy theories in support of his position on Sunday. After astrophysicist Neil deGrasse Tyson stepped...

from NASA Watch http://ift.tt/23x5aV4
via IFTTT

Fun with a new data set: Chang'e 3 lander and Yutu rover camera data

Here, for the first time in a format easily accessible to the public, are hundreds and hundreds of science-quality images from the Chang'e 3 lander and Yutu rover.

from Planetary Society Blog http://ift.tt/1ZXtU44
via IFTTT

NASA Stays on Course for Asteroid Redirect Target

NASA still plans to pluck a boulder off the surface of asteroid 2008 EV5, return it to lunar orbit and send a crew of astronauts for a visit in about ten years.

from Planetary Society Blog http://ift.tt/1SMSPYX
via IFTTT

NASA Observes Day of Remembrance


Chuck Resnik, brother of Space Shuttle Challenger astronaut Judith Resnik, left, and NASA Administrator Charles Bolden, right, visit the Space Shuttle Challenger Memorial during a wreath laying ceremony that was part of NASA's Day of Remembrance on the 30th anniversary of the Challenger accident, January 28, 2016, at Arlington National Cemetery. via NASA http://ift.tt/1OSseWB

NASA to Announce Science, Technology Missions for First Flight of Space Launch System

NASA Television will air the announcement of the selection of a fleet of small satellites to launch on the inaugural flight of the agency’s Space Launch System (SLS). The event is at 11 a.m. EST (10 a.m. CST) Tuesday, Feb. 2, from NASA’s Marshall Space Flight Center in Huntsville, Alabama.

January 28, 2016
from NASA http://ift.tt/1PIsFGk
via IFTTT

NASA to Announce Science, Technology Missions for First Flight of Space Launch System

NASA Television will air the announcement of the selection of a fleet of small satellites to launch on the inaugural flight of the agency’s Space Launch System (SLS). The event is at 11 a.m. EST (10 a.m. CST) Tuesday, Feb. 2, from NASA’s Marshall Space Flight Center in Huntsville, Alabama.

January 28, 2016
from NASA http://ift.tt/1PIsFGk
via IFTTT

And the David N. Schramm Science Journalism Award for 2016 Goes To…

I am very honored to let y’all know that I have received the David N. Schramm Science Journalism Award for 2016!

The annual award is given by the High Energy Astrophysics Division (HEAD) of the American Astronomical Society, the largest society of professional astronomers in the US, and is meant “to recognize and stimulate distinguished writing on high-energy astrophysics. The prize was established to improve the general public’s understanding of this exciting field of research.”

The award’s namesake, David Schramm, was an astrophysicist who studied the Big Bang. Much of his research involved how the lightest elements (hydrogen, helium, and lithium) were created in the first few moments after the birth of the Universe, and how those would affect other properties we see in the cosmos today. I never met him, but I wish I had; he sounds like he was an interesting fellow.

HEAD gave me the award for an article I wrote in Slate last year called, “A Supermassive Black Hole’s Fiery and Furious Wind”, about how the matter piles up and heats up around a black hole, which can blow off a ferocious wind of particles so strong it can sculpt the shape of the entire galaxy around it. Here’s an excerpt:

We also know that every big galaxy we look at has a supermassive black hole in its very center. If that black hole has gas and matter falling into it, the accretion disk can be huge and ridiculously, soul-crushingly bright. The luminosity of such an object can easily outshine the hundreds of billions of stars in the host galaxy,  and make the black hole visible clear across the Universe.
This sets up an interesting problem. When you have a monster in the middle like that, how does it affect the rest of the galaxy? A curious fact was discovered many years ago; the mass of the black hole in a galaxy seems to correlate with how the stars in the galaxy orbit. You might think “duh” to that, but hang on. Even though a black hole can have a mass of a billion times the Sun, that’s a teeny tiny fraction of the mass of a galaxy with  a few hundred billion stars in it.
Somehow, the black hole is affecting the galaxy around it on a huge scale. How?

If you want the answer, click through. I had a lot of fun writing that article. It covers a big, sweeping topic — why the sizes of gigantic black holes are apparently tied to the large-scale behavior of galaxies, which isn’t at all obvious — and uses new findings to help answer a question that had been bugging astronomers for years.

The field of high-energy astrophysics doesn’t have a hard and fast definition, but it covers objects and events that can generate high-energy light at the top of the electromagnetic spectrum:  X-rays and gamma rays. These are among the most violent events in the Universe: exploding stars, colliding galaxies, gamma-ray bursts, black holes gobbling down matter, newly-formed neutron stars glowing fiercely hot, and the like. I’ve always had a love for such brain-crushing events — probably spurred on by watching disaster movies as a kid.

I never did scientific research in high-energy astrophysics per se, but I was involved in the field for many years. Back in 2000, I left my job working on Hubble Space Telescope to move to California and be a part of the Sonoma State University NASA Education and Public Outreach group, headed by Lynn Cominsky. We developed educational products based on several NASA high-energy missions like Fermi, Swift, NuSTAR, XMM-Newton, and more.

It was (pardon the expression) a crash course on high-energy astrophysics, and I had a chance to learn so much about all these amazing astronomical objects and events from some of the top men and women in the field. I wrote tens of thousands of words for the web, brochures, classroom activities, grant proposals, and even games we created. This was all in the service of educating teachers, students, and the public about the high-energy Universe, but it also filled a need in my own brain to find out as much as I could about all this fascinating science.

Whenever I write about black holes or gamma-ray bursts now, I’m reminded of my time learning about them back then. It’s nice to be able to tie together different times in my life and use them to help me in my writing.

I am deeply honored to accept this award, especially because it comes from my peers in the writing and scientific community, and I thank them sincerely.



from Bad Astronomy http://ift.tt/1JILaIp
via IFTTT

The Dark Cloud of the Wolf

The space between stars is not empty.

Dark, cold, ghostlike material lurks there, as thin as a politician’s promise. Astronomers call this material “dust”, but don’t be fooled; it’s not like the little tumbleweeds you find under your desk. This stuff is made of grains of minerals and complex carbon-based molecules much like soot, created in the atmospheres of stars and blown out into the depths of space.

In the denser clouds of dust there might be a million particles in a single cubic centimeter of space. That may sound like a lot, but it’s one ten-trillionth the density of the air you breathe.

Still, over hundreds of trillions of kilometers, even material this ethereally dispersed adds up. These grains and molecules of dust are very good at absorbing visible light, blocking it from passing through the clouds. As it happens, many of these clouds are located in the plane of our galaxy, the parts of our sky where stars are crowded together. When a cloud is between us and those stars, it looks like a hole in space, a place where the galaxy forgot to make stars.

The picture at the top of this article is one such cloud: Lupus 4, a vast filamentary structure 400 light years away and about ten light years across. It was taken with the Wide Field Imager on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile, and the field of view is about a degree across: twice the width of the full Moon on the sky. That’s staggeringly big. Some people say it looks like a spider, but to me it more resembles some sort of cephalopod, its tentacles reaching out to us…

And that description is more apt than you might think.

Lupus is the constellation of the wolf, located not far from the center of the galaxy in the sky, where dust, gas, and stars are thickest. Lupus 4 is part of the sprawling Scorpius-Centaurus OB association, a loose cluster of massive stars that’s one of the very closest to Earth. These stars are young, and don’t live long; after a few million years they explode, scattering heavy elements into space.

A little while back, scientists studying ocean floor sediments examined a core taken out of the Atlantic Ocean seabed. They found a spike in an isotope of iron, called iron-60, dating to about three million years ago. Iron-60 is radioactive with a short half-life, and as far as we know only produced naturally in one place: a supernova. An exploding star.

That means either the material blasted away from a supernova swept over the Earth and deposited that material, or our solar system passed through a region of space where the blast wave from a supernova had stagnated (stopped after plowing through the material between the stars). Since iron-60 decays rapidly, either way it means this must have been from a cosmically young supernova.

As it happens, the stars in the Scorpius-Centaurus OB association are at the right distance to be implicated in this. Millions of years ago, one of them reached the end of its life, blew up, and sent material fleeing outwards at a substantial fraction of the speed of light. Some of that material managed to reach Earth, fall to the bottom of the ocean, and await our notice.

I mentioned that clouds like Lupus 4 appear to be where the galaxy forgot to make stars. But ironically, these clouds are generally the sites of star formation; it’s just hidden from us by the thick soup of dust. It’s possible that the star that blew up all those ages ago formed in a cloud just like Lupus 4 (perhaps in one of its neighboring clouds), and in death managed to physically touch our planet across four thousand trillion kilometers of space.

Like I said. Its tentacles, reaching out to us…



from Bad Astronomy http://ift.tt/1PD3Y7W
via IFTTT

ISS Daily Summary Report – 01/27/16

Burning and Suppression of Solids – Milliken (BASS-M):  Yesterday Kopra completed reconfiguration of the Microgravity Science Glovebox (MSG) Facility and started setup of hardware for BASS-M.  Today he completed the BASS-M setup.  During the setup, there was an issue with the data from the power/video unit.  He was able perform troubleshooting and recover the data, however due to the extended time the first BASS-M run had to be deferred.  The BASS-M investigation tests flame-retardant cotton fabrics to determine how well they resist burning in microgravity. Results benefit research on flame-retardant textiles that can be used on Earth and in space.   Low Earth Orbiting Navigation Experiment for Spacecraft Testing Autonomous Rendezvous and Docking (LONESTAR):  Today Kelly and Peake opened the Japanese Experiment Module (JEM) Airlock inner hatch and extended the Airlock Slide Table into the JEM.  They then installed the Cyclops deployer on the Slide Table, installed a Small Fine Arm (SFA) Plate on Cyclops, and then installed the Lonestar on Cyclops.  Lonestar contains satellites AggieSat4 (built by Texas A&M University students) and Bevo-2 (built by University of Texas students).  Deployment is planned for Friday, January 29.  After free-flying safely away from the ISS, AggieSat4 will eject the BEVO-2 satellite.  Both satellites then perform cross-linking communications, exchange data, link to GPS, and transmit to ground radio stations.  LONESTAR is used to further develop and refines autonomous navigation, rendezvous and docking software and procedures.  Future NASA missions to destinations such as asteroids and other celestial bodies require the use of autonomous navigation systems.   Cognition:  Peake performed his Flight Day 46 session of the Cognition experiment today.  The Individualized Real-Time Neurocognitive Assessment Toolkit for Space Flight Fatigue (Cognition) investigation is a battery of tests that measure how spaceflight-related physical changes, such as microgravity and lack of sleep, can affect cognitive performance. Cognition includes ten brief computerized tests that cover a wide range of cognitive functions, and provides immediate feedback on current and past test results. The software used allows for real-time measurement of cognitive performance while in space.   Dynamic Surf 3: Peake exchanged the Video Recording Unit (VRU) hard disk drive within JAXA’s Image Processing Unit (IPU) for the Dynamic Surf 3 investigation.  A disk drive filled with data generated from the experiment was replaced with a fresh drive for continued recording.  The Dynamic Surf 3 investigation is part of a series of JAXA experiments designed to provide insight into the underlying principles of Marangoni convection.  These experiments demonstrate in microgravity the flow transition phenomena from steady to oscillatory, chaotic, and finally turbulent.  Observations are made of fluid convection during formation of a silicone oil liquid bridge that is generated by differential heating of two discs within the Fluid Physics Experiment Facility (FPEF). The results of this investigation could ultimately drive the design and development of more efficient fluid flow based systems and devices.   Ras Labs-CASIS-ISS Project for Synthetic Muscle: Resistance to Radiation (Synthetic Muscle):  Peake took a set of historical photos of the synthetic muscle samples.  The purpose of this investigation is to measure the effects of radiation on proprietary synthetic muscle materials in space and earth environments. Robots made of these materials could provide assistance to humans in space, enhance survivability of robots during deep space travel, and provide support in extreme radiation environments on Earth.   Fine Water Mist Portable Fire Extinguishers (PFE) Deployment:  Kopra deployed two Fine Water Mist PFEs today. Once the Fine Water Mist PFEs were stowed in the USOS Portable Emergency Provision (PEP) locations, Kopra attached new instruction cue cards to the exterior of each location. Fine Water Mist PFEs are the preferred type of fire extinguisher for open cabin fire scenarios, but cannot be used behind racks. In the event that a Fine Water Mist PFE is unavailable, a CO2 PFE may still be used.   Orbital ATK (OA)-4 Cargo Operations:  All three USOS Crew will continue transferring Cygnus cargo to ISS today. As of yesterday afternoon, approximately 22 hours remain to be completed.  Cygnus is scheduled to unberth from ISS on February 19th.   ISS Reboost:  ISS performed a reboost this afternoon using the Progress 61P thrusters.  This reboost is the second in a series of reboosts to target the planned conditions for the Soyuz 44 landing on March 2nd, Soyuz 46 four orbit rendezvous on March 19th, and Progress 63 four orbit rendezvous on March 31st. ISS Reboost.   Payload Multiplexer/Demultiplexer (MDM) #2 Loss Of Communications:  Overnight Payload MDM #2 experienced a High Rate Data Link (HRDL) card latch up, which prevented communications with the MDM and ISS Payloads.  Flight Controllers attempted to command a reset of the card twice without success. They then commanded a MDM transition to Payload MDM #1 and have restored communications to ISS Payloads.  Later, Ground teams powercycled Payload MDM #2 in order to recover communications with the unit. The MDM is currently serving as a backup to Payload MDM #1.     Today’s Planned Activities All activities were completed unless otherwise noted. Environmental Health System (EHS) Microbial Capture Device (MCD) – In-flight Microbiology Water analysis and data recording Cygnus Cargo Operations TV conference  with participants of the 10th S.P. Korolev Russian National Youth Readings SYN_MUSCL – Photography CYCLOPS – Big Picture Overview Video Of Greetings Video Footage for Roscosmos Press Service VEG-01 – Plant Photo JEMAL – Slide Table extension CYCLOPS – P/L Installation on JEM Airlock Slide Table Study of cardiovascular system under graded physical load on VELO Pumping brine and urine from EDV-U to Progress 429 (SM Aft) Rodnik H2O Tank and Flushing Connector Operator assistance in study of cardiovascular system under graded physical load on VELO Replacement of СО2 Filter Unit (БФ) ИК0501 (Install No.166 (00068062R, СМ1РО_4_449_1 bag 249-17). Dismantled СО2 Filter Unit 00068061R  – for disposal.  Reflect changes in IMS) Verification of ИП-1 Flow Sensor Position Operator assistance in study of cardiovascular system under graded physical load on VELO Study of Cardiovascular System Under Graded Physical Load on VELO JEMAL – Slide Table Retraction BASSM – Preparation Operations […]

January 28, 2016 at 12:54AM
from NASA http://ift.tt/1nR2Jfp
via IFTTT

2016年1月27日 星期三

An Airglow Fan from Lake to Sky


Why would the sky look like a giant fan? Airglow. The featured intermittent green glow appeared to rise from a lake through the arch of our Milky Way Galaxy, as captured last summer next to Bryce Canyon in Utah, USA. The unusual pattern was created by atmospheric gravity waves, ripples of alternating air pressure that can grow with height as the air thins, in this case about 90 kilometers up. Unlike auroras powered by collisions with energetic charged particles and seen at high latitudes, airglow is due to chemiluminescence, the production of light in a chemical reaction. More typically seen near the horizon, airglow keeps the night sky from ever being completely dark. via NASA http://ift.tt/1lRVIJA

Astronaut Pushes Next President For Larger NASA Budget

An astronaut's complaint about the president perfectly captures what is wrong with NASA, TechInsider "During a Reddit AMA from the International Space Station on Jan. 23 Astronaut Scott Kelly called out the US government for its lack of financial support...

from NASA Watch http://ift.tt/1SchJld
via IFTTT

UPDATE: NASA Remembers Its Fallen Heroes, 30th Anniversary of Challenger Accident

NASA will pay will tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues, during the agency's Day of Remembrance on Thursday, Jan. 28, the 30th anniversary of the Challenger accident. NASA's Day of Remembrance honors members of the NASA family who lost their lives while furthering the cause of

January 27, 2016
from NASA http://ift.tt/205P85b
via IFTTT

Local Concerns About Virginia Space Launches

Accomack Supervisors Blasted With Issues, Eastern Shore Post "The rocket that malfunctioned at Wallops Island in October 2014 showed a grim picture of what could happen to nearby landowners. NASA's blast zone is worrying those who reside inside, people whose...

from NASA Watch http://ift.tt/1OQ0yBz
via IFTTT

Engineers Mark Completion of Orion’s Pressure Vessel


NASA’s Orion spacecraft is another step closer to launching on its first mission to deep space atop the agency’s Space Launch System rocket. On Jan. 13, technicians at Michoud Assembly Facility finished welding together the primary structure of the Orion spacecraft destined for deep space, marking another important step on the journey to Mars. via NASA http://ift.tt/1OPBnPJ

Wide views of Mars from Mars Express

Geologist and amateur space image processor Justin Cowart has dug into the Mars Express archives and located some lovely, wide views across great swaths of the Martian globe.

from Planetary Society Blog http://ift.tt/1Pjx4xx
via IFTTT

Team Celestron

I’ve liked Celestron for a long time; they make really nice optical gear like telescopes, binoculars, and more. A few years back they sponsored a couple of science panels I moderated when I wrote for Discover Magazine, and ever since then we’ve had a nice relationship. They also sponsor my company Science Getaways, for example. I have a few of their ‘scopes and binocs, and I love using them.

So I’m pleased and flattered that they asked me to join Team Celestron, a group of interesting folks who use their equipment. On that page you’ll find a few photos and videos I’ve taken through my ‘scopes, and some info about me, too.

Others on the team include Caroline Moore, the youngest person to discover a supernova, Thierry Legault, one of the single most gifted astrophotographers on the planet; and some physicist dude named Stephen Hawking.

As I mentioned in my Christmas telescope buying guide, the reason I’m happy to endorse Celestron is simple: I like their stuff. It’s good quality at a reasonable price, and if you take care of it you’ll have a scientific instrument that will last for many, many years. But it’s more than just for science: It’s fun



from Bad Astronomy http://ift.tt/1WO0G7R
via IFTTT

McCain Seeks to Reverse RD-180 Legislation

McCain vows to undo U.S. legislation that eased Russian rocket engine ban, Reuters "U.S. Senate Armed Services Committee Chairman John McCain on Wednesday said he planned to introduce legislation that would strike language included in a massive 2016 spending bill...

from NASA Watch http://ift.tt/1nnW5N2
via IFTTT

NASA Day of Remembrance

NASA Remembers Its Fallen Heroes, 30th Anniversary of Challenger Accident "NASA will pay will tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues, during the agency's Day of Remembrance on...

from NASA Watch http://ift.tt/1OYXMb7
via IFTTT

I’m Shocked — SHOCKED — To Find That Fluid Dynamics Is Going On Here!

On human spatial and time scales, stars seem motionless. Sure, they rise and set, but that’s a reflection (literally) of the Earth spinning on its axis once a day. But the stars themselves move, orbiting the center of the galaxy.

Stars are so terribly far away that this motion appears diminished to almost nothing; you need a telescope and lots of time to even measure it. But in real terms they’re hauling mass; the Sun, as an example, is moving at a staggering 220 kilometers per second around the galactic core. That’s three quarters of a million kilometers per hour!

In general, though, that motion has little effect on the galaxy itself. If you’re traveling through a vacuum, who cares? There’s nothing to get in your way.

But in reality there’s stuff in the way: The ethereally thin gas and dust between stars. This material makes a lab vacuum look like a thick soup; there may be only one atom for every cubic meter of space out there. Some places are denser, with hundreds or millions of particles per meter3, but even that is thin stuff.

But it adds up. And while a star itself is small, massive stars are hot, and blow a wind of particles out from them like a solar wind. This wind can extend for billions of kilometers, well out into space.

Now combine all this: Take a massive, hot star, let it blow a huge wind, and set it free to blast through space at hundreds of kilometers per second. What do you get?

You get what you see in the photo at the top of this post: a shock wave. Like water flowing around the bow of a ship, the interstellar material gets compressed in a vast curve in front of the star. I’ve written about this before; one of my favorite astronomical photos of all time shows the massive star Zeta Ophiuchi ramming through material in space, creating a spectacular bow wave.

The material warms up and glows in the infrared, making it easy to spot with space observatories like Spitzer and WISE, which are both sensitive to those wavelengths. Astronomers combed through the data, identifying over 200 such curved structures. Follow up observations on 80 of them showed they were due to speedy massive stars (some are created in other ways, like patchy gas and dust around a newborn star compressed by the baby’s violent outbursts).

One such wave they found is pretty cool; it’s actually from two stars. Seen here, the stars are HD240015 and HD240016, and the waves overlap, like a curvy M. The stars are both B-types, hotter and more massive than the Sun. However, I couldn’t find much info on them. They must be related, perhaps born in the same cluster. Usually, stars moving fast enough to create these waves were ejected from clusters, tossed out by a close encounter with another star, given a velocity boost by the gravity of the combined masses of all the other stars. I wonder if these two were together when they were kicked out, now traveling through the galaxy as a matched pair.

I like studies like this. We learn about the way stars emit material, how they move through space, and just what they’re moving through. And we also get such cool images! It’s a reminder that the Universe is in constant motion, and the scales are vast. And it helps personally, too. I figure if an octillion-ton star can rocket through space at dozens of times faster than a rifle bullet, I can probably be coaxed out of my chair every now and again and move around a bit myself. 



from Bad Astronomy http://ift.tt/1PjmsPa
via IFTTT

ISS Daily Summary Report – 01/26/16

Burning and Suppression of Solids – Milliken (BASS-M) Preparation:  In preparation for BASS-M operations this week, Kopra reconfigured the Microgravity Science Glovebox (MSG) Facility and installed Smoke Point In Co-flow Experiment (SPICE) hardware into the MSG work volume.  He will perform the BASS-M ignitor test tomorrow, prior to BASS-M sample testing.  The BASS-M investigation tests flame-retardant cotton fabrics to determine how well they resist burning in microgravity.  Results benefit research on flame-retardant textiles that can be used on Earth and in space.   Sprint Ultrasound:  Kelly performed his Flight Day 300 thigh and calf ultrasound scans today with assistance from Kopra and guidance from the Sprint ground team.  Ultrasound scans are used to evaluate spaceflight-induced changes in the muscle volume.  The Sprint investigation evaluates the use of high intensity, low volume exercise training to minimize loss of muscle, bone, and cardiovascular function in ISS crewmembers during long-duration missions.  Upon completion of this study, investigators expect to provide an integrated resistance and aerobic exercise training protocol capable of maintaining muscle, bone and cardiovascular health while reducing total exercise time over the course of a long-duration space flight.  This will provide valuable information in support of the long term goal of protecting human fitness for even longer space exploration missions.   Payload Data Handling (PDH) Removal and Replacement:  Peake removed the Payload Data Handling (PDH) unit in the JEM and replaced it with PDH2.  The PDH unit being replaced is an engineering model flown up on ATV5 to replace a failed PDH.  PDH2 provides added capability for support of a hot-standby backup and automatic switchover for contingencies.  The PDH units handle commanding to JAXA payloads, downlink channels and High-Rate payload data downlink.   Observation Analysis of Smectic Islands in Space (OASIS) Removal:  Kelly completed OASIS removal from the Microgravity Science Glovebox (MSG), an activity begun last week.  Kopra then inserted the Burning and Suppression of Solids-Milliken (BASS-M) experiment into the MSG.   Orbital ATK (OA)-4 Cargo Operations:  Peake and Kopra continued transferring Cygnus cargo to ISS today.  Approximately 22 hours of transfer operations remain to be completed.  Cygnus is scheduled to unberth from ISS on February 19th.   Today’s Planned Activities All activities were completed unless otherwise noted. OTKLIK. Hardware Monitoring USND2 – Hardware Activation Cygnus Cargo Operations ER4 – Insertion of USB drive to allow starting of the SW load Fine Motor Skills –  Examination OASIS – Observation and Analysis Glisser-M Video Hardware Battery Charge JPM – Payload Data Handling (PDH) Unit R&R BIOCARD. Experiment Ops VIZIR Experiment SPRINT – Scanning Ops Orlan suit No.4 Height Sizing SPRINT – Operator Assistance with the Experiment Orlan 4 Backup Bladder Leak Check Orlan No.4 and БСС (Orlan Interface Unit) leak checks and valve tests ER4 – Insertion of DVD drive to allow starting of the SW load Orlan 6 Backup Bladder Leak Check SAMS – Sensor Removal Orlan No.6 and БСС (Orlan Interface Unit) leak checks and valve tests Bag consolidation in Columbus USND2 – Hardware Deactivation Photo/TV – LAB coder power cycle SAMS Installation in Columbus 24-hour ECG Monitoring (termination) Glisser-M Video Hardware Battery Charge  (terminate) Preparation of Glisser-M Video Hardware used during USOS EVA Terminate EMU LLB Battery Autocycle Columbus Bag Restow 24-hour BP monitoring (terminate) IMS Delta File Prep МИРТ-3 Micro-integrator Changeout (А507, А607, А707). Install Nos.10395332, 10343135, 10343136. Dismantled МИРТ-3 10368557, 10368558, 10368560 Cygnus Cargo Operations BASS – Crew Conference INTERACTION-2. Experiment Ops Cleaning FGB Gas-Liquid Heat Exchanger (ГЖТ) Detachable Screens 1, 2, 3 Cygnus – Cargo Operations Tagup BASS Equipment Setup СОЖ Maintenance Air Heater Fan [БВН] Screen Cleaning in ТК 719 ER4 – DVD Removal and Stowage BASSM – Payload Ops Overview IFM – Waste and Hygiene Compartment (WHC) – Full Fill   Completed Task List Items None   Ground Activities All activities were completed unless otherwise noted. Nominal System Commanding PDH2 Checkout   Three-Day Look Ahead: Wednesday, 01/27: Cyclops Install, BASS M, Water Mist PFE Deploy, Cygnus Cargo Transfer Thursday, 01/28: Cygnus Cargo Transfer, PS120 J Install, JPM Int Port Camera Relocation Friday, 01/29: Cygnus Cargo Transfer, BASS-M Ops, Lonestar Deploy, Kelly Off Duty   QUICK ISS Status – Environmental Control Group:                               Component Status Elektron On Vozdukh Manual [СКВ] 1 – SM Air Conditioner System (“SKV1”) On [СКВ] 2 – SM Air Conditioner System (“SKV2”) Off Carbon Dioxide Removal Assembly (CDRA) Lab Operate Carbon Dioxide Removal Assembly (CDRA) Node 3 Override Major Constituent Analyzer (MCA) Lab Idle Major Constituent Analyzer (MCA) Node 3 Operate Oxygen Generation Assembly (OGA) Process Urine Processing Assembly (UPA) Standby Trace Contaminant Control System (TCCS) Lab Full Up Trace Contaminant Control System (TCCS) Node 3 Off  

January 27, 2016 at 01:11AM
from NASA http://ift.tt/1Uq83kr
via IFTTT

2016年1月26日 星期二

A Candidate for the Biggest Boom Yet Seen


It is a candidate for the brightest and most powerful explosion ever seen -- what is it? The flaring spot of light was found by the All Sky Automated Survey for Supernovae (ASASSN) in June of last year and labelled ASASSN-15lh. Located about three billion light years distant, the source appears tremendously bright for anything so far away: roughly 200 times brighter than an average supernova, and temporarily 20 times brighter than all of the stars in our Milky Way Galaxy combined. Were light emitted by ASASSN-15lh at this rate in all directions at once, it would be the most powerful explosion yet recorded. No known stellar object was thought to create an explosion this powerful, although pushing the theoretical limits for the spin-down of highly-magnetized neutron star -- a magnetar -- gets close. Assuming the flare fades as expected later this year, astronomers are planning to use telescopes including Hubble to zoom in on the region to gain more clues. The above-featured artist's illustration depicts a hypothetical night sky of a planet located across the host galaxy from the outburst. via NASA http://ift.tt/1QyMpv7

Running Down a Comet

The Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) telescope has discovered its first comet of 2016.

from Planetary Society Blog http://ift.tt/1QquYL7
via IFTTT

Pioneering Space National Summit One Year Later: No Clear Direction

Space Advocates Like To Talk To Themselves (Sept 2015) "Rick Tumlinson and his New World Institute had all the space advocates in Washington all pumped up for his "Pioneering Space National Summit" event in February 2015. No media were allowed...

from NASA Watch http://ift.tt/1nNpbGa
via IFTTT

A City of Stars

My love of globular clusters is on record. Of all the objects in the deep sky — that is, outside our solar system — they are the ones that, through a telescope, look most like what they’re supposed to look like.

Nebulae are great, and so are galaxies, but when you look at them through an eyepiece of a typical small telescope you usually only see a faint smudgy thing. But when you get a globular in the crosshairs, you see it. Thousands of stars packed together so tightly that the center looks like a continuous blur of light, fanning out into a splendor of luminous points as you look farther out from the core. The overall sensation is of a beehive frozen in time.

Of course, having a big telescope helps, too. The image above is by my friend Adam Block, who used the 0.81 m Schulman Telescope at the Mt. Lemmon SkyCenter in Arizona to take it. It’s a total of six hours of exposure time (two hours each using red, green, and blue filters), and to be honest I’m not sure how many stars you can see in it. Tens of thousands at least. Maybe a hundred thousand.

This picture is a little unusual, in that stars are resolved right down to the core. I’m not used to that in pictures taken from the ground; from Hubble, sure, because there’s no air to blur the image. Adam must have had really steady skies when he took his exposures.

Globular clusters are massive cities of stars, held together by their own gravity, each orbiting the center like, well, like a bee flying in circles around a hive. Over 150 of these clusters orbit the Milky Way galaxy, and some huge galaxies have thousands (though they probably stole them; stripping them from smaller galaxies as they eat the less massive prey, absorbing them into their own bodies).

I’d go into detail here, but I already have once before in episode 35 of Crash Course Astronomy:

M15 was always one of my favorites to observe, and Adam’s picture makes me want to see it again with my own eyes. Sadly, it’s already low to the west at sunset this time of year, and will soon be behind the Sun. But in a few months it’ll be high in the east again at night. That’ll be when the weather is warmer here in Colorado, more conducive to long nights behind the eyepiece. 



from Bad Astronomy http://ift.tt/1Pi56Ca
via IFTTT

Space Station Flyover of the Mediterranean


Expedition 46 flight engineer Tim Peake of the European Space Agency (ESA) shared this stunning nighttime photograph with his social media followers on Jan. 25, 2016, writing, "Beautiful night pass over Italy, Alps and Mediterranean." via NASA http://ift.tt/201CFPP

So, About that Video of the Space Station Passing in Front of Saturn…

Last week, a seemingly spectacular astronomy video went viral. It was created by a German astrophotographer named Julian Wessel, and it showed the International Space Station passing directly in front of Saturn. I saw links to it all over Twitter and Facebook, and no wonder: Catching such an event takes an extraordinary amount of skill and planning. Plus, it’s just cool.

There’s only one problem: It wasn’t real.

Wessel used images from different observing sessions and composited them together to make the video and the image. Under some circumstances this is OK — for example, when different telescopes are used, or when you’re reconstructing a scene (like the Earthrise image taken by LRO). But in any case, the important bit is to note that it’s a composite.

Wessel didn’t do this; on his website he said, "I managed it [sic] to photograph the ISS in front of a planet again. In this case it was the Lord of the Rings: Saturn." He also wrote, "Fortunately everything happened as planned and I could make the capture... You can see the Video of the Event on my YouTube... This is a great effort for me as an astrophotographer. It takes time, patience, preperation and a little bit of luck to get a shot like this, but at the end the hard work pays off!" That certainly makes it sound like he got footage of the actual event. He also submitted it to the Astronomy Picture of the Day site, which ran it (though, after review, they have since taken it down).

The video was convincing enough that it got past a lot of people. When I first saw it I was amazed, but it also set my skeptic sense tingling. It bugged me that he happened to catch the ISS directly in front of Saturn in one frame of the video; the odds of that are pretty low. And it all looked too crisp and clean, but that wasn’t enough for me to declare it a fake.

However, not long after the video became public, a whole bunch of amateur astronomers were on the case. My friend Stephen Ramsden (who does solar observing) sent me a note letting me know that people were buzzing over some serious issues with the video. Also, Christopher Go, who is a phenomenal planetary astrophotographer, also pointed out many problems with the video. As a few examples:

  • The ISS should have been about twice as big as the disk of Saturn, yet they’re the same size in the video.
  • ISS is far brighter than Saturn, but they appear equally well-exposed.
  • Saturn should have been grainy looking, noisy, due to the very short exposure.
  • At the time Wessel claimed to have taken the video, the Sun had just risen. The sky should have been very bright, and Saturn would have been extremely low contrast, almost washed out by the bright sky. Saturn was also very low in the sky, and atmospheric distortion should have made it look very fuzzy.
  • It was very cloudy that morning at the location Wessel claims to have taken the video.

I could list many more issues; most are pretty technical and circumstantial, but it’s a long list.

I sent Wessel an email asking him some specific questions, but I did not hear back. Not long after that, he removed the entry about the video from his site and Facebook, and removed the video from YouTube (which is why I didn’t embed it in this post) He also posted to an astrophotography forum, saying the image was a composite, but that doesn’t jibe with the claims he made earlier, which purport it to depict the actual event.

I don’t know what Wessel’s motivations are, and I won’t speculate. I will note that others are looking at some of his previous work and calling foul on that as well. Update, Jan. 26, 2016: Wessel has posted in the APOD message board apologizing for what he did.

But I’m writing about this because I think it’s important to note that it’s easy to get fooled. Software is so good that stuff like this can be created pretty easily, and it can be good enough to fool people passingly familiar with astrophotography, at least at first (though generally not for long, as we’ve seen here). But for people who don’t know much about it, this kind of stuff gets believed, and passed around social media rapidly.

That bugs me for a couple of reasons. One is simply about the nature of truth: People shouldn’t create fakes and then claim they’re real, and if they do then it should be called out. But more, it diminishes the actual photographs, the actual videos, and the very very hard work astrophotographers put into their craft.

For me, I love to share the joy and wonder of the Universe, and when artwork or fakes or computer simulations get passed around as the real thing, it diminishes what’s really going on around us. I prefer to appreciate things as they are.

A lot of fake astrophotographs get shared on social media (especially by those spammy Twitter feeds with handles like SciencePorn and Uberfacts, and usually with no links or credit to the original creator). I know a lot of people love seeing these pictures, but I think it’s important to separate fact from fiction. The Universe is actually and truly a stupendously gorgeous and astonishing thing all on its own. We can appreciate artwork depicting it, but we should also understand what’s real and what isn’t.

And here's some irony for you. As I was drafting up this article, I got a note that Szabolcs Nagy was in fact able to catch ISS transiting Saturn on Jan. 25 in Gran Canaria! Here's the video:

Yes, I checked, and this one looks real! It is possible to get this sort of thing on video. Like I said, it takes patience and planning, and maybe a bit of luck, too. See? Astronomy is really cool.

I suggest following FakeAstropix and PicPedant on Twitter to see if that viral pic you saw on Facebook is real or not. 

I’ve also written about fake pictures many times. Here’s a selection:

An Unreal Picture of Sunset at the North Pole (extremely viral drawing)
An Unreal Mars Skyline
Planetary Alignment Pyramid Scheme
A Fake and a Real View of the Solar Eclipse… FROM SPACE!
No, That’s Not a Picture of a Double Sunset on Mars
No, That’s Not a Real Photo of an Aurora from Space

But sometimes they are real:

Is That Viral Quadruple Rainbow Picture Real?
Yes, That Picture of the Moon and the Andromeda Galaxy Is About Right
An Eclipse of a Different Kind
And, finally, anything Thierry Legault does.



from Bad Astronomy http://ift.tt/1NxFb3Z
via IFTTT

ISS Daily Summary Report – 01/25/16

Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) Zero Robotics Competition:  Kelly and Kornienko set up the SPHERES hardware and executed the SPHERES Zero Robotics tests with participation from students on the ground. The SPHERES Zero Robotics investigation establishes an opportunity for high school students to design research for the ISS. As part of a competition, students write algorithms for the SPHERES satellites to accomplish tasks relevant to future space missions. The algorithms are tested by the SPHERES team and the best designs are selected for the competition to operate the SPHERES satellites on board the ISS.   Combustion Integration Rack (CIR) Switch Reconfiguration:  Peake reconfigured the CIR to prepare for the resumption of FLame Extinguishment Experiment (FLEX)-2 which is scheduled to begin in early February.  He used the EXPRESS Laptop Computer (ELC) to reconfigure the Fluids and Combustion Facility (FCF) Input/Output (I/O) Processor Ethernet switch to increase the data transfer rate in CIR.  FLEX-2 studies the rate and manner in which fuel is burned, the conditions that are necessary for soot to form, and the way in which a mixture of fuels evaporate before burning.  The results from these experiments will give scientists a better understanding how fires behave in space and will provide important information that will be useful in increasing the fuel efficiency of engines using liquid fuels.   Electrostatic Levitation Furnace (ELF) Setup Troubleshooting:  On Friday, Kelly was only able to connect one of two Quick Disconnects (QDs) to mate the Moderate Temperature Loop (MTL) supply and return lines due to inadequate accessibility. Today Peake performed steps to increase the accessibility but was unable to provide enough additional room for crewmembers to connect the remaining QD.   The JAXA ground team is evaluating today’s results.  The ELF is an experimental facility designed to levitate, melt and solidify materials employing containerless processing techniques that use the electrostatic levitation method with charged samples and electrodes. With this facility, thermophysical properties of high temperature melts can be measured and solidification from deeply undercooled melts can be achieved.   Urine Processor Assembly (UPA) Fill Drain Valve Modification Kit Installation:  Kopra replaced the existing Water Recovery System (WRS)-2 Access Panels with new modified panels that will allow the Recycle Tank to be filled and drained in place.   Orbital ATK (OA)-4 Cargo Operations:  Peake and Kopra continued transferring Cygnus cargo to ISS today.  There are approximately 26 hours of Cygnus cargo ops remaining to be completed.   Cygnus Cabin Fan Anomaly:  Overnight, the Cygnus cabin fan performance degraded significantly and was subsequently powered off.  Delta pressure (DP) had been slowly decreasing through the OA-4 berthed duration and initial trending was predicting that the DP would remain within operational limits through a February 19 departure.  However, in recent days the downward DP trend has increased more rapidly.  Portable fans are available for the crew to use in order to ingress Cygnus in support of today’s cargo operations.  Ground teams are looking into possible troubleshooting plans.   Today’s Planned Activities All activities were completed unless otherwise noted. RSS1,2 Reboot SEISMOPROGNOZ. Downlink data from Control and Data Acquisition Module (МКСД) HDD (start) CIR – Familiarization with Experiment Plan Activation and Inspection of Orlan suits No. 4, No. 6 Urine Processor Assembly (UPA) – Gathering assembly equipment from the kit for the drain valve SPHERES – Crew Conference Cygnus Cargo Operations SPHERES – Hardware Setup and Checkout Urine Processor Assembly (UPA) – Installation of equipment from the kit for the drain valve DAN. Experiment Ops WRS Sample Collection Проверка БСС в СО1 RS still cameras date and time synchronization to the station time SAMS Adapter Setup in Columbus Procedure Review ПхО БСС checkout. SPHERES Greeting Students SPHERES Camera Setup and Test Ops Exercise Data Downlink via OCA Scrubbing water system by using БОС in ПхО Urine Processor Assembly (UPA) – Equipment Stowage SEISMOPROGNOZ. Download data from Control and Data Acquisition Module (МКСД) HDD (end) and start backup RGN – Initiate drain into EDV Multi purpose Small Payload Rack 2 (MSPR2) Electrostatic Levitation Furnace (ELF) QD Troubleshoot SPHERES Hardware power off, battery replacement, and stowage Ops with Orlan ORU 24-hour ECG Monitoring (start) RGN – Terminate water drain into EDV Water Processing using MCD 24-hour BP monitoring (start) Columbus GFI Test Preparation GFI test of all twelve COLUMBUS SUPs 120V DC power outlets TOCA Potable Water Dispenser (PWD) Sample Analysis CIR ELC Install Install battery packs on Orlan No.4 and No.6 Telemetry Unit (БРТА) Cygnus Cargo Operations Conference HABIT – Adjusting camcorder and conducting conference Preparing for replacement of microintegrators МИРТ-3 (А507, А607, А707). Gather new МИРТ-3 S/N 10395332 (008746R, ФГБ1ПГО_4_420_1), 10343135 (00043325R, ФГБ1ПГО_4_418_1), 10343136 (00056396R, ФГБ1ПГО_2_219_1) БК-3М Oxygen bottle pressure check in DC1 БК-3М oxygen bottle pressure check in ПхО Columbus GFI Test Post Reconfiguration CIR – Switching Device Reconfiguration IMS Delta File Prep Journals Nominal Entry Subject CIR ELC Install TOCA Data Recording ER4 – Laptop network interface config   Completed Task List Items None   Ground Activities All activities were completed unless otherwise noted. Nominal System Commanding   Three-Day Look Ahead: Tuesday, 01/26: SPRINT, BASS Hardware Setup,  LLB Charge Term, Cargo Ops, JPM PDH A R&R Wednesday, 01/27: Cyclops Install, BASS M, Water Mist PFE Deploy, Cargo Ops Thursday, 01/28: Cygnus Cargo Transfer, PS120 J Install, JPM Int Port Camera Relocation, Vertigo S/W Load   QUICK ISS Status – Environmental Control Group:                               Component Status Elektron On Vozdukh Manual [СКВ] 1 – SM Air Conditioner System (“SKV1”) On [СКВ] 2 – SM Air Conditioner System (“SKV2”) Off Carbon Dioxide Removal Assembly (CDRA) Lab Operate Carbon Dioxide Removal Assembly (CDRA) Node 3 Override Major Constituent Analyzer (MCA) Lab Idle Major Constituent Analyzer (MCA) Node 3 Operate Oxygen Generation Assembly (OGA) Process Urine Processing Assembly (UPA) Standby Trace Contaminant Control System (TCCS) Lab Full Up Trace Contaminant Control System (TCCS) Node 3 Off  

January 26, 2016 at 12:41AM
from NASA http://ift.tt/1VnDHiH
via IFTTT

Upgraded LightSail Software Completes First Round of Flight Testing

LightSail has completed its first round of flight testing. The spacecraft is now armed with new software that will transmit almost three times as much health and status data back to Earth than it did during last year's test flight.

from Planetary Society Blog http://ift.tt/1ZPJQFy
via IFTTT

2016年1月25日 星期一

Where Your Elements Came From


The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts. Elements like phosphorus and copper are present in our bodies in only small amounts but are essential to the functioning of all known life. The featured periodic table is color coded to indicate humanity's best guess as to the nuclear origin of all known elements. The sites of nuclear creation of some elements, such as copper, are not really well known and are continuing topics of observational and computational research. via NASA http://ift.tt/1nJFrIo

What If The Martian Never Made It Home?

British explorer Henry Worsley dies crossing Antarctic, 30 miles short of goal, CNN "Worsley's last statement sent from Antarctica said: "The 71 days alone on the Antarctic with over 900 statute miles covered and a gradual grinding down of my...

from NASA Watch http://ift.tt/1nkr6BJ
via IFTTT

You Cannot Learn From What You Have Forgotten

NASA Has To Fight The Forgetting, NBC "[Space workers] need the consequent inescapable ache of fear and the gnawing of doubt that keeps asking, over and over, if they've covered all angles and done all they can. And if their...

from NASA Watch http://ift.tt/1S78GBO
via IFTTT

China invites public on-board its robotic missions; and how to download Chang'e data

China plans a busy future in robotic space exploration. Besides the scientific merit, what interests me most about the upcoming Chang'e 4 mission is their intention to get the public involved.

from Planetary Society Blog http://ift.tt/1WKqba7
via IFTTT

Lady Science

This may come as a shock to you, but science has something of an issue with sexism.

I’ve written about this many times, and you can probably find a few hundred thousand more words about it elsewhere. The problems run a broad spectrum of issues, including pay, hiring practices, treatment of women in the lab/field/academic setting, publishing, the “leaky pipeline”, and more.

Worse, these issues have a long, entrenched, historical precedent. Even when we talk about them we run into problems, like highlighting exceptional women who break barriers, instead of all the women who came before them and paved the way.

That’s why I’m happy that Lady Science exists. As they say on their page, they are

… a multifaceted collaborative writing project focused on women in science, technology, and medicine. Our purpose is to highlight women's lives and contributions to scientific fields, to critique representations of women in history and popular culture, and to provide an accessible and inclusive platform for writing about women on the web. 

I’m all for that. The editors, Anna Reser and Leila McNeill, have collected many of the essays written and put them together into a new anthology called, of course, Lady Science, available for free at Smashwords. The essays are thoughtful and interesting, and anyone interested in the stories behind science will enjoy them.

I’m also pleased to note that McNeill and Reser asked me to write the foreword to the anthology. That may strike some as odd; I’m a middle aged bearded white man, pretty much the archetype stereotypical portrayal of a scientist. But sexism isn’t a women’s problem, it’s a problem for everyone. Also it helps if men speak up, because men who might be a part of the problem will tend to listen to other men more than women. Ironic, but once this idea gets traction with them that problem itself might diminish.

So I wrote the foreword, and Reser and McNeill have graciously allowed me to reproduce it here (I added a few links for further info). Please give it a read, then go download the book.

Lady Science Foreword

When I was in grad school, we had a woman on our faculty.

Note the singular. A woman, out of roughly 15 or more full-time professors. The thing is, within statistical uncertainty this was about the average for astronomy departments at the time; until very recently the typical university astronomy department faculty ratio was about nine men for every woman.

The reasons for this are legion; historically fewer women stay in astronomy, for example. But that just leads to the next question: Why do women leave the field? The reasons for that are legion as well; One study showed a lack of role models led to retaining fewer women over time. Other factors include bias in hiring women, bias in salaries, and the traditional gender roles played out in family life (women who are parents tend to leave science careers at a far higher rate than men).

When you read the essays in Lady Science, the historical roots of these problems become clear. Environmental sexism, stemming from entrenched male scientific authority, was pretty terrible a century ago, and still a huge problem today. I’ll let the men and women who have done the research and written those essays speak for themselves. There are ample examples.

But a point I see brought up in some of the essays is worth noting, and that’s the idea of celebrating “firsts”. It seems like a good thing, a way of acknowledging women who broke through barriers. Marie Curie, first woman Nobel prize winner; Valentina Tereshkova, first woman astronaut; Sally Ride, first American woman astronaut, and so on.

While it’s important to acknowledge these women and their accomplishments, there’s a series of subtle problems with doing that as well: It spends a lot of energy and effort on only a select few women, it pushes aside the accomplishments of other women in that field who may not have received the spotlight, it implies that there were few or no women before the one woman who “made it”, and it still categorizes women into a subset of history that could be labeled “other”.

I’m guilty of highlighting “firsts” myself, and reading the essays in Lady Science really made me think about the pitfalls of doing that; it seems obvious in retrospect but completely invisible to me at the time.

That’s an especially pernicious aspect of sexism: You sometimes need an outside viewpoint to discover it, and even then it’s not a lock. You have to absorb the ideas, internalize them. That’s why I write about women’s issues in science. When I was younger I really was totally insulated and blind to the problems women face in life, let alone in pursuing scientific fields. Over the years, many of the wonderful women and men I’ve known have helped me better understand these issues. I’m still walking down that road, but I’m glad I know I’m on that road.

But even after all this time I sometimes stumble, or at least walk right into a pothole I didn’t know was there. The “Women’s Firsts” is only the most recent one. I think it’s still good to point out woman who break barriers, but we have to be careful not to do so at the risk of minimizing anyone else.

Many of the women in the Lady Science articles are people I had never heard of, and this is a good opportunity to get to know them. If we focus only on the firsts we lose many of their stories. As time goes on we then lose the details on the inner workings of how women as a group, as members of a team, participated in and critically supported the greatest scientific achievements of our species.

Incidentally, I just checked: as I write this my old astronomy department now has 30 faculty, and four women. That’s better than before, a trend in the right direction. It’s a long ways from parity, but as you’ll read in these articles, and as history has taught us, change rarely happens overnight. We have a long way to go, but increasing awareness may be the most powerful tool we have to help clear the path.



from Bad Astronomy http://ift.tt/1OJWz9G
via IFTTT

A Half-Enceladus


This half-lit view of Enceladus bears a passing resemblance to similar views of Earth's own natural satellite, but the similarities end there. via NASA http://ift.tt/1UmfrwW

2015: The Hottest Year on Record

I know it’s funny to read this when the east coast of the US is shoveling out from under a blizzard, but that doesn’t make it any less true: 2015 was the hottest year on record for the planet. And not only the hottest, but blasting through the previous record, held by… the year before. 2014.

No matter how you slice it, how you analyze it, last year was by far the hottest year on record. Here’s a graph showing combined land and ocean surface temperatures:

That shows the temperature anomaly — the variation from an average (in this case, from 1951 – 1980) — of the Earth going back to 1850. As you can clearly see, 2015 spikes up at the end, showing a huge jump in temperature even from just last year (which, I remind you, was a record-breaker itself).

Of course, single records aren’t as important as trends. In this case, the trend is incredibly obvious: Up.

This graph was put together by the notoriously conservative Berkeley Earth project (which was originally created questioning the global warming consensus among scientists, I’ll note). But even they were unequivocal about 2015 setting the record.

And it’s not just them.

That graph is by the Japanese Meteorological Agency, and also shows the temperature anomaly (using the average from 1981 – 2010, which is hotter than the average from 1951 – 1980 due to global warming), and again shows 2015 poking its head up above the crowd.

The graph above is by the UK Met Office (this uses an average from 1961 – 1990). Look familiar?

Here’s NASA’s version, using the GISS temperatures:

Huh.

If you prefer your data in animated form, here’s a video put together by NASA showing the change in average temperatures from 1880 – 2015:

The NOAA reports that the margin by which 2015 broke the hottest annual record is also the largest on record — it’s not just the temperature that broke the record, it was the spike itself that was the largest in historical documentation. They also report that the 16 hottest years since 1880 have all occurred in the past 17 years. Only 2000 didn’t make the list.

In other words: It’s getting hotter, and 2015 blew us away.

As it happens, we’re in the midst of a pretty strong El Niño, which tends to raise temperatures. How big an effect did that have? Climate scientist Gavin Schmidt looked into that, calculating the impact of El Niño on temperatures, correcting for it. He created this graph:

As you can see, the corrected (red) temperature anomaly is still a record breaker. Even without El Niño, 2015 would have been the hottest year on record. While there’s an effect, of course — El Niño only accounts for about 0.07°C of extra temperature — it’s not the primary reason 2015 was the hottest year on record.

The primary reason is global warming.

NASA posted a graph showing this as well:

Note the red line; that’s a fit to the average temperatures using just years where there were El Niños. Note the trend! It goes up. If this current heat were just due to El Niño, that line would be horizontal. Instead, we see even those years getting hotter with time. That’s because the planet is getting hotter.

So there you go. The facts are in. Really, they have been for a long, long time. The globe is warming. We are pumping CO2 into the air to the tune of 40 billion tons per year, and that stuff stays up there. It lets light through from the Sun that heats the ground, but then won’t let the thermal infrared radiation escape into space. The Earth can’t cool down, so it gets hotter.

The oceans are absorbing that heat. They’re expanding, with sea levels rising. They’re acidifying as they try to absorb the extra CO2. The warmer water and air is melting ice at a devastating pace at both poles. We’re seeing weirder, wilder, more extreme weather (and yes, the east coast blizzard has its roots in warming as well; warmer water means more moister evaporates into the air, and when that meets cold arctic air you get even more snow).

So look again at those graphs. They are far more than just squiggly lines; they are our future. That’s us in those graphs, and the new, hotter world we are creating in which we must live.



from Bad Astronomy http://ift.tt/1NuZRtq
via IFTTT

Europa Budget Bulge

Van Kane explains how the key development for NASA’s mission to Europa will be an agreement on how the agency plans to accommodate the monetary bulge that will come from funding the mission.

from Planetary Society Blog http://ift.tt/1PfG4no
via IFTTT

2016年1月24日 星期日

Star Cluster R136 Bursts Out


In the center of star-forming region 30 Doradus lies a huge cluster containing some of the largest, hottest, and most massive stars known. These stars, known collectively as star cluster R136, were captured in the featured image in visible light by the Wide Field Camera 3 in 2009 peering through the Hubble Space Telescope. Gas and dust clouds in 30 Doradus, also known as the Tarantula Nebula, have been sculpted into elongated shapes by powerful winds and ultraviolet radiation from these hot cluster stars. The 30 Doradus Nebula lies within a neighboring galaxy known as the Large Magellanic Cloud and is located a mere 170,000 light-years away. via NASA http://ift.tt/1Qmpbqa

NASA Closed In Washington DC Area on Monday

OPM Status "Applies to: Monday, January 25, 2016 FEDERAL OFFICES in the Washington, DC area are CLOSED. Emergency and telework-ready employees required to work must follow their agency's policies, including written telework agreements."...

from NASA Watch http://ift.tt/1K5GEUh
via IFTTT

From Beneath the Earth to Above the Sky

Regular readers know that when it comes to science, my two loves are astronomy and geology. That love is multiplied when they come together.

like in the photo above, a six-panel mosaic taken by master photographer Rogelio Bernal Andreo (you can purchase a print, too). It shows the Hawaiian volcano Kilauea just days ago, when it was spewing an enormous plume of noxious sulfury gas and water vapor into the sky. It looks like an explosive eruption, but that’s an illusion! You’re actually seeing the plume illuminated from below by the lava pooling in the Halema’uma’u crater. It’s a common sight, though not usually this dramatic or so beautifully photographed.

Above it, you can spot the Pleiades star cluster, and Orion to the left. The mix of stars, sky, black lava landscape, and eerily glowing plume is really magical.

I’ve been fortunate to have visited Kilauea twice now; once as a site visit for Science Getaways, and then again for the actual trip. I wrote about the first visit, and made a video at the summit with Halema’uma’u behind me:

As it happens, my wife and I are planning another Getaway to the islands. We had a fantastic time there last September, and I’m really looking forward to going back. Hopefully I’ll have more info about that in the coming months, but we have a spring getaway to plan first. Stay tuned!



from Bad Astronomy http://ift.tt/1WGY3o4
via IFTTT

2016年1月23日 星期六

Big Dipper, Deep Sky


The Big Dipper is an easy to recognize, well-known asterism in northern skies, though many see the Plough or Wagon. Famous bright nebulae of the north can also be found along its familiar lines, highlighted in this carefully composed scene with telescopic insets framed in the wider-field skyview. All from Messier's catalog, M101 and M51 are cosmic pinwheel and whirlpool on the left, spiral galaxies far beyond the Milky Way. To the right, M108, a distant edge-on spiral galaxy is seen close to our galaxy's own owl-faced planetary nebula M97. Taken on January 16, the wider-field view seems to include an extra star along the Dipper's handle, though. That's Comet Catalina (C/2013 US10) now sweeping through northern nights. via NASA http://ift.tt/1TfGb3O

2016 Blizzard by Moonlight


An image from Suomi NPP shows the Eastern United States covered with snow and lit by a blizzard. via NASA http://ift.tt/1PqCo4e

How REXIS Made It on OSIRIS-REx

The OSIRIS-REx instrument team has successfully installed the Regolith X-ray Imaging Spectrometer (REXIS) on the spacecraft. However, there is more to the story of how REXIS made it onto the spacecraft.

from Planetary Society Blog http://ift.tt/1SDRELj
via IFTTT

Charon by Plutolight

In a long list of really unusual images of Pluto’s big moon Charon taken by the New Horizons spacecraft, the one above may be the unusualest. And most poetic.

It’s Charon, lit by Plutolight.

Let me explain.

Pluto is so far from the Sun — three billion kilometers — that to it, the Earth and Sun are basically in the same direction. Even though the probe picked up a boost by swinging past Jupiter, it still is on a trajectory that’s basically pointing away from the Sun.

So it passed through the Pluto system nearly perpendicular to the orbital plane of the moons, like a dart thrown at a dartboard. Here’s a diagram showing its path:

Once it passed Pluto and Charon, New Horizons spun around to see them backlit by the Sun (that’s how the phenomenal images of Pluto’s atmosphere and haze layers were taken). That was on July 15, 2015. Two days later the spacecraft was over two million kilometers past the system, five times the distance of the Earth to the Moon. From that angle, both objects looked like thin crescents from New Horizons. In the Charon picture, you can see the bright slice of the moon lit by the Sun.

However, if you were standing on Charon’s surface on the night side facing Pluto, the sky would have been dominated by Pluto itself, looking roughly half full. Even though the Sun is far away, and only feebly illuminates Pluto, the tiny world is highly reflective. The sunlight bounced off its surface and lit up the night side of Charon. That light was then reflected into space, with some of it collected by New Horizons’ camera. That’s why the night side of Charon is faintly aglow. That’s Plutolight!

The same thing happens with our Earth and Moon, when you see the dark side of the new Moon faintly glowing. That’s Earthlight, sunlight reflected off Earth, which hits the Moon, and then reflects back to us on Earth (it happens with Saturn’s moons, too). This phenomenon is sometimes called “the old Moon in the New Moon’s arms”.

Incidentally, this is a view of Charon we can never get from Earth. We always see it and Pluto fully lit, their dark sides facing away from us, hidden away.

So here we have the old Charon in the new Charon’s arms, due to the gentle and whisper-thin light from Pluto aiding the brighter but still cold light from the far distant Sun, a visage never before seen by those of us on our warm, blue world, so far in toward the light.

The New Horizons mission was all about science. But it comes with a bonus of poetry, as all science does.



from Bad Astronomy http://ift.tt/1KwkyW3
via IFTTT

2016年1月22日 星期五

International Space Station Transits Saturn


From low Earth orbit to the outer Solar System, this remarkable video frame composite follows the International Space Station's transit of Saturn. On January 15, the well-timed capture from a site near Dulmen, Germany required telescope and camera to be positioned along the predicted transit centerline, a path only 40 meters wide. That put the camera about 1,140 kilometers away from the space station during the transit and 1,600,000,000 kilometers away from Saturn. A video rate of 42 frames per second follows the orbital outpost moving quickly from lower right to upper left. The transit itself lasted about 0.02 seconds, with one frame showing the station directly in front of the ringed gas giant. Of course, you could also try to capture the International Space Station as it transits Jupiter. via NASA http://ift.tt/1RYJH3C

Monster Storm Viewed From Space

Massive Blizzard Heads Up U.S. East Coast "NASA-NOAA's Suomi NPP satellite snapped this image of the approaching blizzard around 2:35 a.m. EST on Jan. 22, 2016 using the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument's Day-Night band."...

from NASA Watch http://ift.tt/1WBJrq7
via IFTTT

xkcd: Possible Undiscovered Planets

Randall Munroe is a genius at disguising seriously educational infographics as funny jokes.

from Planetary Society Blog http://ift.tt/1QpQKAK
via IFTTT

NASA Remembers Its Fallen Heroes, 30th Anniversary of Challenger Accident

NASA will pay will tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues, during the agency's Day of Remembrance on Thursday, Jan. 28, the 30th anniversary of the Challenger accident. NASA's Day of Remembrance honors members of the NASA family who lost their lives while furthering the cause of

January 22, 2016
from NASA http://ift.tt/23jt46j
via IFTTT

Blizzard Bears Down on U.S. East Coast


NASA-NOAA's Suomi NPP satellite snapped this image of the blizzard approaching the U.S. East coast around 2:35 a.m. EST on Jan. 22, 2016 using the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument's Day-Night band. via NASA http://ift.tt/1NpA4CQ

Crash Course Astronomy: Everything, the Universe…and Life

So.

48 episodes, over eight hours of content, 100,000 words, a year and a half of work, topics ranging from quantum fluctuations to the death of the Universe… and, finally, here we are.

The last episode of Crash Course Astronomy.

When I put together the syllabus for the show, I found it helped to be flexible as the scripts got written; galaxies got split into two episodes, as did cosmology (at least, dark matter and energy). We had 45 episodes listed for a long time, and I left one slot open Just In Case. And then, last summer, I figured out what it should cover, and placed it as the final one in the series, because that’s where it should be.

So I present to you the last episode of Crash Course Astronomy: Everything, The Universe.. and Life.

I think I pretty much covered how I feel about UFOs in this episode— that is, dismissive until actual evidence shows up. If you want more, I’ve written about this before, and answered a question during a public talk about it, too.

Still, it’s fun to think about alien life, and while I wrote about it in my book Death from the Skies! (in the context of how aliens might attack us, including the likelihood of infestation of alien viruses and bacteria), it’s a rich vein, and I really enjoyed writing this episode, especially since I could include a bit about my old friend Seth Shostak.

If there’s life in space, we may know soon, whether it’s from intelligent species who want to chat, or being able to detect biological signatures in the atmospheres of exoplanets. I expect that it won’t be a big, sudden announcement like it usually is in the movies, but more of a “what have we got here” kind of thing, slowly building more evidence over time.

Either way, what a time that will be.

But my time, Crash Course speaking, is up. With a full series behind me, it’s time to move on to whatever’s next for me (I’m working on some ideas; stay tuned). And if I may indulge myself…

I want to thank everyone involved in making Crash Course Astronomy. That means Hank Green who invited me to host; Derek Muller, who relayed the question; my editors Nicole Sweeney and Blake De Pastino; director Nick Jenkins; sound designer Michael Aranda (he scored the music based on the CC music from other series); my wonderful friend and science consultant Michelle Thaller; the folks at Thought Café for their wonderful animations; and all the nerds at Sci Show who put up with me sitting in their room muttering and eating up their wifi after we’d finish recording for the day.

My biggest thanks goes out to all of you who watched the show. I hope you got to see a bigger picture of the Universe from it, and found a new way to appreciate it.

Being a part of Crash Course has been an extraordinary honor, and one that I cherish. Thank you.



from Bad Astronomy http://ift.tt/1JoMuQv
via IFTTT