NASA Astronaut Scott Kelly Kicks Off Geography Trivia from Space Keith's note:Have you seen any of Scott Kelly's photos (in high resolution) on the official NASA Flickr page? You won't. He only posts low resolution versions on Twitter at @StationCDRKelly....
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2015年4月22日 星期三
ISS Daily Summary Report – 04/21/15
Osteocytes and mechano-transduction (Osteo-4): Cristoforetti successfully performed Tray 3 operations, removing the last three bioreactors from Osteo-4, and stowed them in MELFI. The Osteo-4 locker was then powered off. The three trays of Osteo-4 are an automated bone cell culture experiment that studies the effects of microgravity on the function of osteocytes, which are the most common cells in bone. These cells reside within the mineralized bone and can sense mechanical forces, or the lack of them, but researchers do not know how. Osteo-4 allows scientists to analyze changes in the physical appearance and genetic expression of mouse bone cells in microgravity. Russian Joint Research (RJR) Microbial Air Sampler (MAS) and Surface Sample Kit (SSK) Analysis: Padalka analyzed the MAS and SSK samples taken on 16 April, performing colony counts and photographing the microbial and fungal slides. The investigation refines locations and surfaces prone to microbial contamination throughout the ISS, shares monitoring technologies and data between NASA and Roscosmos, and provides a scientific basis for decisions about future microbial monitoring, both on ISS through its extended life, and on other future human exploration spacecraft. Ocular Health: Kornienko continued Ocular Health activities, performing his Flight Day 30 fundoscopy, with the assistance of Cristoforetti and ground remote guiders. The fundoscope is utilized to image the fundus (interior surface of the eye including the retina, optic disc, macula, and fovea). Ocular Health protocol calls for a systematic gathering of physiological data to characterize the risk of microgravity-induced visual impairment/intracranial pressure in ISS crewmembers. Researchers believe that the measurement of visual, vascular and central nervous system changes over the course of this experiment and during the subsequent post-flight recovery will assist in the development of countermeasures, clinical monitoring strategies, and clinical practice guidelines. Biological Research in Canisters (BRIC)-21: Cristoforetti inserted the four cartridge samples in the Minus Eighty Degree Celsius Laboratory Freezer for ISS (MELFI), thereby halting the growth period approximately 24 hours after initiation. The samples will be returned on SpX-6 for ground analysis. The BRIC-21 investigation tests the hypothesis that microorganisms subjected to a space flight environment experience a spectrum of stress responses, with some leading to alterations in the antibiotic susceptibility. The goals of BRIC-21 are to analyze microbes to identify the suite of stress responses induced by exposure to spaceflight and simulated microgravity, and determine viability, resistance levels to a battery of antibiotics, and rates of spontaneous mutation to antibiotic resistance in microbes. Gene, Immune and Cellular Responses to Single and Combined Space Flight Conditions – A (Triplelux-A): Cristoforetti stowed the six Triplelux Reservoir A canisters in the Biolab Thermal Control Unit (TCU)1 (-20 °C) and the two Triplelux Experiment Container (EC) Handling Mechanism (HM) Interfaces in the Biolab TCU 2 (+4°C) until start of the experiment run scheduled for next week. Triplelux-A uses a rat macrophage cell line to investigate and compare the ability of macrophages to kill pathogens under normal gravity and microgravity conditions. The goal is to gain a better understanding of immune suppression in spaceflight. Rodent Research-2 Center for the Advancement of Science in Space (RR-2 CASIS): Kelly and Virts performed the first set of four sample collections with Kelly as primary operator while Virts assisted, placing samples in containment then in MELFI. The objective of this research is to monitor the effects of the space environment on the musculoskeletal and neurological systems of mice as model organisms of human health and disease. Living in microgravity results in significant and rapid effects on the physiology of mice that mimic the process of aging and some diseases in humans on Earth, including muscle atrophy and the loss of bone mineral density. This project will help scientists discover new molecular targets that can facilitate the development of novel therapeutics for the treatment of muscle and bone-related diseases. Long-duration exposure to microgravity will also induce changes in gene expression, protein synthesis, metabolism, and eye structure/morphology that will be identifiable as a series of assessable biomarkers for tracking the onset and progression of disease. On Board Training (OBT) Dragon Debrief Conference: Virts and Cristoforetti completed a conference with ground teams to debrief lessons learned from the SpX-6 Dragon OBTs performed by the crew prior to berthing. Today’s Planned Activities All activities were completed unless otherwise noted. SLEEP Questionnaire IMMUNO. Saliva Sample (Session 1) IMMUNO. First stress test, questionnaire data entry. RSS1,2 Reboot IMMUNO. Test-Tube Blood Collection (finger). IMMUNO. Blood Sample Processing. IMMUNO. Equipment Stowage Regeneration of БМП Ф2 Micropurification Cartridge (start) Sample Collection/Incubation using Surface Sample Kit (SSK) and Microbial Air Sampler (MAS) FINEMOTR – Experiment Ops OSTEO4 – Bioreactor Prep for MELFI Stowage PAO hardware setup REMOTE RS LAPTOP Installation in USOS Crew Prep for PAO REMOTE RS LAPTOP Tests from КЦП2. TV Conference with Russia Today TV Channel Correspondent Rodent Research (RR) – Hardware Installation and Connection REMOTE RS LAPTOP Tests from КЦП1. СОЖ Maintenance REMOTE RS LAPTOP Setup Teardown on USOS Rodent Research (RR) – Installation of Refrigerated Centrifuge Removal of ССД305 Light from ТКГ 424 (DC1) and Stowage in Spares Kit DAN. Experiment Execution Support DAN. Experiment Ops. OSTEO4 – Sample Insertion into MELFI OSTEO4 – Glove Bag Stowage Replacement of РТ-50-1М No.9 (А209) – Equipment Prep. Rodent Research (RR) – Refrigerated Centrifuge Configuration Rodent Research (RR) – Hardware Installation and Connection WRS Water Sample Analysis ECON-L. Observations and Photography EML – Cable Removal Rodent Research (RR) – Closeout Ops OSTEO4 – Hardware Deactivation and Removal Verification of ИП-1 Flow Sensor Position BRIC21 – Canister Insertion into MELFI PLR/MELF – Transfer of Samples from Polar to MELFI TPLXA – Biolab TCU1 Hardware Setup MPEG-2 video downlink test via KU-band prior to ТКГ 426 Docking to the ISS ТКГ 424 (DC1) Stowage and IMS Ops TOCA Data Recording Video Footage for Nauka 2.0 TV Channel Rodent Research (RR) – MELFI Sample Insertion Rodent Research (RR) – Refrigerated Centrifuge Configuration ТКГ 424 (DC1) Stowage Completion Report (S-band) Rodent Research (RR) – Experiment Ops IMS Delta File Prep Rodent Research (RR) – Closeout Ops Rodent Research (RR) – […]
April 22, 2015 at 12:54AM
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NASA Astronaut Scott Kelly Kicks Off Geography Trivia from Space
Where over the world is NASA astronaut Scott Kelly? Kelly, who is working and living aboard the International Space Station on a one-year mission, wants to test your knowledge of the world with a geography trivia game on Twitter.
April 22, 2015
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April 22, 2015
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NASA Tail Technology Could Someday Reduce Airplane Fuel Use
In this photo taken from a chase plane, the Boeing ecoDemonstrator 757 flight test airplane --with NASA's Active Flow Control technology installed on the tail -- makes a final approach to King County Boeing Field in Seattle, Washington. via NASA http://ift.tt/1OGdlnA
Does Michoud Have Welding Issues?
Incorrectly Built SLS Welding Machine To Be Rebuilt, Slashdot "A giant welding machine, built for NASA's multi-billion dollar Space Launch System (SLS), has to be taken apart and rebuilt because the contractor failed to reinforce the floor, as required, prior...
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Bill Nye: Do As I Say Not As I Do
Heading down to DC to catch an #EarthDay flight on Air Force One tomorrow with the President. We're going to #ActOnClimate.— Bill Nye (@BillNye) April 21, 2015 Keith's note: Planetary Society CEO Bill Nye (The Science Guy®) is certainly...
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25 Years of Cosmic Treasures: Hubble’s 12½ Greatest Hits
On April 25, 1990, the world—the Universe—changed.
That was the day the crew of STS-31 deployed the Hubble Space Telescope into orbit. This magnificent observatory has a special place in my heart. When it launched I was in graduate school in astronomy, and had just received my master’s degree. I was looking for Ph.D. research, and my adviser mentioned he was on a project to use Hubble to observe exploding stars … and now, 25 years later this week, Hubble is still going strong, doing astronomy.
And in my way, I am too.
I worked on Hubble one way or another for a decade, including being on a team that built one of the cameras that was installed on Hubble in 1997. I’ve written so much about Hubble over the past 2½ decades I don’t think there’s much more I can say about it. At the bottom of this post there are links to some of my favorite articles.
But I can still show you pictures.
The sheer amount of science Hubble has done is stunning, but of course most people know it because of the gorgeous imagery it’s provided for a quarter-century. That’s no shock, and that’s just fine in my book. People need to know more about the Universe in which they live, and if Hubble is that gateway, who am I to complain?
So let me show you what Hubble’s best at: spectacular, mind-expanding and brain-melting pictures. I was going to choose 25, but I feared Slate’s servers would burst into flame, so instead I picked 12½. Why that? Well, it’s 25 / 2, and it turns out I have a picture that kinda sorta qualifies as the ½. You’ll see.
So here, let your eyes soak up the majesty of the Universe, and fill your brain with the joy of astronomical discovery.
Heavenly Chess Piece
Just below Orion’s belt is the star Sigma Orionis, well over 1,000 light-years from Earth. It’s actually a pentuple star, a five-star system, blasting out as much light as 75,000 Suns! It illuminates and heats a ridge of hydrogen gas nearby, and the famous Horsehead Nebula is a thick cloud of colder gas and dust silhouetted against it, deep black in normal images.
But using infrared cameras, Hubble sees light coming from inside the dust cloud, bringing out details within it. All those towers pointing up—and even the head of the horse itself—are illuminated from above by Sigma Ori, and in fact are being dissolved by its intense radiation. Like so many things in the Universe, we’re getting a snapshot of a beautiful object that is ephemeral; this too shall pass. However, the Horsehead is the site of ongoing star formation, so while the cocoon will eventually dissolve, the stars will live on for millions and even billion of years.
When Galaxies Collide
In the 1960s, astronomer Halton Arp catalogued more than 300 oddly shaped galaxies, many of which are interacting pairs, behemoths distorting each other through their mutual gravity. Many are physically colliding, dancing an eons-long performance that will end with them merging into one much larger galaxy.
Arp 273 is just such a pair, 300 million light-years from Earth. The smaller one may have actually passed through the larger one, suffering tremendous distortion as it did so; gas clouds slamming into each other has triggered a burst of star formation in it. The bigger of the pair was also affected; the spiral arms are off-kilter and asymmetric, a common reaction to the violent encounter.
Both have retained their overall spiral shape, but if they fall back together, that may be lost. But for now, and the next few million years at least, they provide this lovely sight.
Ring Around the Supernova
As I mentioned, I used Hubble for my Ph.D. work. Specifically, I studied the star Sanduleak -69 202, which exploded and became Supernova 1987A. To be honest, I studied the ring of gas surrounding the star, lit up by the explosion. To me, the supernova was just the Universe’s biggest flashbulb, illuminating the stuff I really wanted to see.
At the time, no other ring like it has ever been seen. The formation mechanism is still a mystery (though we’re learning more about it all the time). The two outer rings are much thinner and an even bigger mystery. This image was taken in December 2006, when the shock wave from the explosion was finally starting to hit the clumpy inner ring. Knots of denser material lit up, making it look like a string of luminescent pearls. You can even see the expanding debris from the supernova inside the ring, elongated into a fishlike shape. That material, moving at several thousand kilometers per second, will eventually slam into the ring as well … and then we’ll see some real fireworks.
Going Very, Very Deep
Hubble isn’t a particularly large telescope, with a 2.4 meter mirror. What makes it special is that it’s in orbit, above our atmosphere that glows faintly (hiding faint objects) and blurs out smaller details. So when you take Hubble and point it at one patch of sky accumulating photons, what you get is sheer awesomeness: the Hubble Extreme Deep Field, a stunning mosaic made up of 2,000 separate images for a total exposure time of 2 million seconds, over three weeks!
Gaze upon that picture, let your eyes wander. With only a few exceptions, every single object in that field is an entire galaxy, a mighty collection of billions or hundreds of billions of stars! Thousands can be seen here, yet this patch of sky is so tiny you could easily cover it many times over with the tip of your pinky at arm’s length. The Universe is vast and terrifying and magnificent beyond our ability to properly express.
Some of those galaxies are more than 10 billion light-years away, and you see them as they were when the Universe was young. This image is a huge boon to astronomers studying the nature of the cosmos, but you don’t need to be a professional scientist to be overawed by it. If this doesn’t give you a chill, check your pulse. You may be dead.
Blowing Smoke
Of all the images Hubble has taken in 25 years, I sometimes think that V838 Monocerotis is the oddest. This star underwent an epic eruption, blasting out a huge cloud of dust that has expanded visibly over the years. It’s thought that the cause was the merger of two stars orbiting each other; they spiraled in and then physically consumed each other, forming a single (highly unstable) star, which then erupted.
The cloud expanded so rapidly the change can be seen over just a few years, and this time-lapse shows that happening (with some interpolation between images to make the expansion smoother).
Incredible; we usually don’t get to see change on such short time scales in astronomy, but happily Hubble has revealed it in this case … with the help of expert astrophotographer Robert Colombari, who remastered this amazing shot.
Stellar Beehive
When I was young, hauling my telescope to the end of the driveway to observe the heavens, one of my favorite targets was M15, a globular cluster: A more-or-less spherical cloud of stars about 30,000 light-years away in the constellation of Pegasus. I could easily see hundreds of stars in it … but it has a hundred thousand stars in it, as this Hubble image gloriously reveals.
It’s more than 12 billion years old, an ancient stellar city, and many of its stars have exploded or faded away in old age. There’s even a planetary nebula in it (see the Ring Nebula and NGC 6302 entries below), which you can see as a blue glow to the left of center; that’s a dying star casting off its outer layers, much as the Sun will do six or seven billion years from now.
The Wings of a Butterfly
When stars die, they do not go gently into that good night. Some explode, like Supernova 87A, while stars more like the Sun blow off their outer layers in episodic winds. When these winds of gas collide, they light up, creating breathtaking planetary nebulae. NGC 6302 is a lovely example of such a beast.
Nicknamed the Butterfly Nebula, it has a thick torus of dust around its equator, and two vast lobes of material racing away from the center. Studies of NGC 6302 were able to physically see the gas expanding over the several years that elapsed between subsequent Hubble images, allowing the age of the object: The lobes were ejected rapidly about 2,200 years ago at speeds of hundreds of kilometers per second, while the dusty ring was blown out over a longer period of time that ended shortly before the lobes formed.
It’s odd to think that such beauty is created by the death of a star, but astronomy is loaded with such ironies. Just read about the next object, the Crab Nebula …
Cosmic Crab
The Crab Nebula is one of the most ridiculously fantastic objects in the sky: The rapidly expanding debris from a star that blew itself to bits a millennium ago. Octillions of tons of gas blasted away from the shredded star at an appreciable fraction of the speed of light, and now the remnant (as it’s called) is six light-years across, 600 trillion kilometers.
In this phenomenal Hubble image (using images combined with those from the Very Large Telescope), the different colors represent different elements in the gas. Blue is warm oxygen, red is oxygen that is even warmer (technically, the oxygen is in a higher energy state, what astronomers call “more excited”), and green is sulfur.
Even though it’s 6,500 light-years away, it’s been observed for so long, and the debris expanding so rapidly, that over time the blobs have actually been seen to move. You can use that to calculate the expansion speed of the gas, and even how old it is! For my old job I wrote an educational activity for students to do just that, too.
Pillars of Astronomy
If there is one Hubble picture that stands above the rest, the single most iconic portrait of a celestial object perhaps ever, then it would be the Eagle Nebula, or M 16.
You may know it as the Pillars of Creation.
The name is apt. Each of these three “elephant trunks” is light years long; the biggest is almost 10 light-years stem to stern, nearly 100 trillion kilometers. All three have dense knots of gas and dust at their tips; the ultraviolet light from stars above them are eating away at them, and they protect the material “downstream”, like water flowing around a rock creating a sandbar. The knots are also forming new stars, so again the name is a good one.
The original version of this was taken by my pal Jeff Hester in 1995, and this new version was taken in 2014, after better cameras were installed on Hubble by later Shuttle missions. The detail is stunning, and in fact changes over the two decades (!) between the two images shows the nebula has changed; the material being sculpted by the stars.
And it’s due for a big change: Spitzer Space Telescope data suggest a supernova went off inside the Eagle, and the shock wave will wipe out the Pillars in the next few thousand years. Sic transit gloria aquila.
Jetting Across the Sky
There are times I see a Hubble image and my jaw drops open. This is one of ‘em. This is a shot of a star-forming region in the vast and sprawling Carina Nebula, one of the largest in our galaxy. Like the Pillars of Creation, these are huge towers of gas and dust actively forming stars, the material being blow back by the fierce light of massive stars off the edge of the field of view here.
But in this case we’re a little farther along in the process: the stars at the tips of these pillars have already been born. They still have a disk of material swirling around them, and complex magnetic fields. This all combines to blast material away from the stars along their axes; twin jets of matter that slams into the surrounding material and lights up. As the towers erode—you can see the gas streaming away from them in fine tendrils—they will reveal the newly born stars. The jet phenomenon only lasts a few thousand years, the blink of a cosmic eye, but is revealed in stunning detail by Hubble.
Galaxy on the Edge
I love a sprawling, majestic spiral galaxy, its arms flung wide, dotted with pink clumps of star-forming gas clouds.
But then there’s the Sombrero Galaxy: A very nearly edge-on spiral, located about 30 million light-years away. At this low angle, the dust lanes stand out as its most striking and even its characterizing feature. The patchy spiral arms take on a more subtle appearance, and the huge spherical halo of stars surrounding its core add the final touch to its magical appearance.
Interestingly, it’s smaller than our Milky Way, only 50,000 light-years across (we’re more than twice that broad), yet it’s estimated to have more than three times the mass of our galaxy.
And hmmm … although we see the Sombrero edge-on, from there the Milky Way is seen at about a 45° angle. That would be awe-inspiring. I’m not sure who gets the better part of this deal.
Ring Nebula
One of my favorite kind of Hubble image is where it observes a target with which I’m familiar from my own nights outside with my ‘scope. The Ring Nebula is a staple in any astronomer’s observing; it’s easy to find and a delightful object. It looks like a pale, ghostly smoke ring in the sky.
… until you point a space telescope at it, at least. Then the incredible detail is revealed (caveat: the Hubble images were combined with those of the ground-based Large Binocular Telescope to create this picture). The Ring is another planetary nebula, a collision between winds cast blown off by a dying star. It was always thought to be a spherical shell because it’s so circular, but the Hubble observations proved it isn’t. See the little dark blobs all around the yellow and green parts? If the Ring were a sphere, they’d be distributed throughout, including across the middle. They’re not, which shows we’re looking down the long axis of a barrel-shaped object.
Those radial spikes are real, too: They’re rays of light from the central star that are let through between dark, dense blobs of material, just like rays from the setting Sun!
Hubble’s Day in the Sun
So I promised 12½ pictures, and here you go: That shot above is the last thing you’d ever expect Hubble to photograph: the Sun.
It’s true … kinda (hence the half credit). The kind of digital detectors originally used on Hubble’s main camera would get electrons trapped in them, which needed to be cleaned off. A blast of ultraviolet light does that well, and the Sun is a very bright UV source. Hubble isn’t allowed to point anywhere near the Sun, so the team came up with an unusual solution: Mount a small mirror that stuck up out of the telescope’s main body. Pointing backward, they’d aim Hubble directly away from the Sun, allowing sunlight to pour into the small periscope and into the detectors.
It worked wonderfully, and the images they made were assembled into that mosaic. That’s nuts, but hey, whatever works, right? You can read the whole story at my friend Glenn Schneider’s website. He actually assembled that image.
One last note
Many of the photos you see by Hubble were processed and created by my old friend Zolt Levay, a master at taking the noisy, messy data from the telescope and turning them into artistic masterpieces. He has just published book of Hubble images called Expanding Universe, and it is truly extraordinary. If you love these pictures, you need this book.
Related Posts
- Andromeda (yeah, you really want to click that)
- Why I’m Watching the Hubble Pairs So Intently (my history with Hubble)
- Epic Tantrum Thrown by a 30 Octillion Ton Baby
- Happy 20th Anniversary, Hubble!
- Hubble. Is. Back.
- Bruce Woodgate
- A Story Involving Me, Hubble, and the Late Astronomer Brian Marsden
- Hubble’s 15th Anniversary
- Oh, just search my blog for “Hubble”
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