2016年1月31日 星期日
MWC 922: The Red Square Nebula
Did Someone Hack NASA's Evil Drones?
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Take The NASA LaRC RD Promotion Process Survey
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Is Space Commerce About to Become Real Commerce?
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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.
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2016年1月30日 星期六
A Five Planet Dawn
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.
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2016年1月29日 星期五
Hidden Galaxy IC 342
First Look: Newest LightSail Spacecraft Unfurls Solar Sails
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Media Accreditation Open for Next Commercial Space Station Cargo Mission
January 29, 2016
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Inspiration Endures
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What's up in solar system exploration: February 2016 edition
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Curiosity Self-Portrait at Martian Sand Dune
NASA Television to Air Russian Spacewalk
January 29, 2016
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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.
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ISS Daily Summary Report – 01/28/16
January 29, 2016 at 12:26AM
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2016年1月28日 星期四
Elliptical M60, Spiral NGC 4647
The Truth Is Not Out There: Goofy Flat Earth Rap War
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Fun with a new data set: Chang'e 3 lander and Yutu rover camera data
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NASA Stays on Course for Asteroid Redirect Target
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NASA Observes Day of Remembrance
NASA to Announce Science, Technology Missions for First Flight of Space Launch System
January 28, 2016
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NASA to Announce Science, Technology Missions for First Flight of Space Launch System
January 28, 2016
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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.
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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…
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ISS Daily Summary Report – 01/27/16
January 28, 2016 at 12:54AM
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2016年1月27日 星期三
An Airglow Fan from Lake to Sky
Astronaut Pushes Next President For Larger NASA Budget
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UPDATE: NASA Remembers Its Fallen Heroes, 30th Anniversary of Challenger Accident
January 27, 2016
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Local Concerns About Virginia Space Launches
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Engineers Mark Completion of Orion’s Pressure Vessel
Wide views of Mars from Mars Express
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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.
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McCain Seeks to Reverse RD-180 Legislation
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NASA Day of Remembrance
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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.
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ISS Daily Summary Report – 01/26/16
January 27, 2016 at 01:11AM
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2016年1月26日 星期二
A Candidate for the Biggest Boom Yet Seen
Running Down a Comet
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Pioneering Space National Summit One Year Later: No Clear Direction
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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.
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Space Station Flyover of the Mediterranean
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.
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ISS Daily Summary Report – 01/25/16
January 26, 2016 at 12:41AM
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Upgraded LightSail Software Completes First Round of Flight Testing
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2016年1月25日 星期一
Where Your Elements Came From
What If The Martian Never Made It Home?
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You Cannot Learn From What You Have Forgotten
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China invites public on-board its robotic missions; and how to download Chang'e data
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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.
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A Half-Enceladus
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.
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Europa Budget Bulge
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2016年1月24日 星期日
Star Cluster R136 Bursts Out
NASA Closed In Washington DC Area on Monday
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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!
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2016年1月23日 星期六
Big Dipper, Deep Sky
2016 Blizzard by Moonlight
How REXIS Made It on OSIRIS-REx
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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.
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2016年1月22日 星期五
International Space Station Transits Saturn
Monster Storm Viewed From Space
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xkcd: Possible Undiscovered Planets
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NASA Remembers Its Fallen Heroes, 30th Anniversary of Challenger Accident
January 22, 2016
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Blizzard Bears Down on U.S. East Coast
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.
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