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Fresh Tiger Stripes on Enceladus: Do underground oceans vent through the tiger stripes (in false-color blue) on Saturn's moon Enceladus? The long features dubbed tiger stripes are known to spew ice from the moon's icy interior into space, creating a cloud of fine ice particles over the moon's south pole and creating Saturn's mysterious E-ring. Why #Enceladus is active remains a mystery, as the neighboring moon Mimas, approximately the same size, appears to be quite dead. An analysis of dust captured by Cassini found evidence for sodium as expected in a deep salty ocean. Such research is particularly interesting since such an ocean would be a candidate to contain life. Conversely however, recent Earth-based observations of ice ejected by Enceladus into Saturn's E-Ring showed no evidence of the expected sodium. Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Picture from June 2009 is a high resolution Cassini image of Enceladus from a close flyby #nasa #cassini #space #moons #water #nasabeyond#solarsystem #science #astronomy; -
Searching for Water in the Solar System and Beyond: As our missions explore our solar system and search for new worlds, they are finding water in surprising places. Water is but one piece of our search for habitable planets and life beyond Earth, yet it links many seemingly unrelated worlds in surprising ways. In this artist's concept, the moon #Ganymede orbits the giant planet Jupiter. The Hubble Space Telescope observed aurorae on the moon generated by Ganymede's magnetic fields. A saline ocean under the moon's icy crust best explains shifting in the auroral belts measured by Hubble. Image Credit: NASA/ESA #nasa #space #nasabeyond #astronomy #hubble #hst #science #jupiter; -
From the International Space Station, NASA astronaut Scott Kelly (@stationcdrkelly on Instagram) took this photograph and posted it to social media on April 6, 2015. Kelly wrote, "Australia. You are very beautiful. Thank you for being there to brighten our day. #YearInSpace" Kelly and Russian Federal Space Agency (Roscosmos) cosmonaut Mikhail Kornienko began their one-year mission aboard the space station on March 27. Most expeditions to the space station last four to six months. By doubling the length of this mission, researchers hope to better understand how the human body reacts and adapts to long-duration spaceflight. Image Credit: NASA #nasa #iss #spacestation #isscrew #astronauts; -
This Earth Day, April 22, we're asking you to share pictures and video of your favorite places on Earth using social media – and tag them #NoPlaceLikeHome. At NASA, we explore lots of planets and there’s a lot to love: the mountains on Mars, the rings of Saturn, the 99.77-degree axial tilt of Uranus. Our scientists from around the world have now discovered more than 1,800 planets beyond our solar system. But how about a little something for the home team? It’s Earth Day. Let’s explore our home planet, too. For more information, visit: http://www.nasa.gov/likehome #earth #earthday #nasa #science; -
Aboard the International Space Station, astronaut Terry Virts posted this image and wrote, "Happy Easter." Image Credit: NASA #nasa #space #iss #spacestation #earth @astro_terry;
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Hubble View of a Cosmological Measuring Tape This Hubble Space Telescope image shows the spiral galaxy NGC 3021 which lies about 100 million light-years away in the constellation of Leo Minor, the Little Lion. Among many other types of stars, this galaxy contains Cepheid variable stars, which can be used work out the distance to the galaxy. These stars pulsate at a rate that is closely related to their intrinsic brightness, so measurements of their rate of pulsation and their observed brightness give astronomers enough information to calculate the distance to the galaxy itself. Cepheids are also used to calibrate an even brighter distance marker that can be used over greater distances: Type Ia supernovae. One of these bright exploding stars was observed in NGC 3021, back in 1995. In addition, the supernova in NGC 3021 was also used to refine the measurement of what is known as the Hubble constant. The value of this constant defines how fast the Universe is expanding and the more accurately we know it the more we can understand about the evolution of the Universe in the past as well as in the future. So, there is much more to this galaxy than just a pretty spiral. Credit: NASA & ESA. Acknowledgement: A. Riess, STScI #nasa #hubble #hubble25 #hst #galaxies #galaxy #space #science #stars; -
Set your alarm! On Saturday morning, April 4, 2015, not long before sunrise on the East Coast, the bright full moon over North America should turn a lovely shade of celestial red during a total lunar eclipse. The lunar eclipse will be visible from all parts of the United States. Eastern North America and western South America can see beginning stages of the partial umbral eclipse low in the west before sunrise April 4, whereas middle Asia (India, western China, mid-Asian Russia) can view the ending stages of the partial umbral eclipse low in the east after sunset April 4. Greenland, Iceland, Europe, Africa and the Middle East won't see this eclipse at all. The total eclipse will last only five minutes. From 6 - 8 a.m. EDT, NASA TV will offer live video and NASA astronomer Mitzi Adams will take Twitter questions via @NASA_Marshall on Twitter. Use the hashtag #eclipse2015 to send your questions. #nasa #eclipse #lunareclipse #bloodmoon #space #moon #astronomy #science; -
Phantom Objects Near Dead Quasars: Our Hubble Space Telescope has photographed a set of wispy, goblin-green objects that are the ephemeral ghosts of quasars that flickered to life and then faded. This image is one from the set of bizarre, looping, spiral, and braided shapes around eight active galaxies. The galaxies host a bright quasar that may have illuminated the structures. Image Credit: NASA, ESA, and W. Keel (University of Alabama, Tuscaloosa) #nasa #hubble #hubble25 #hst #galaxies #galaxy #quasar #space #science; -
Space Station Flies Over Super Typhoon Maysak: Typhoon Maysak strengthened into a super typhoon on March 31, reaching Category 5 hurricane status on the Saffir-Simpson Wind Scale. NASA Astronaut Terry Virts captured this image while flying over the weather system on board the International Space Station. Commenting on the storm, Virts wrote, "The eye of #Maysak typhoon really stands out early in the morning with the shadow being cast deep into the vortex." His ESA crewmate on station also viewed the storm and wrote, "Commands respect even from #space: we just flew over typhoon #Maysak." Image Credit: NASA #nasa #iss #space #typhoon #weather #hurricane #astronauts #spacestation; -
Hedgerow Prominence Erupts: A tangled mass of plasma strands rose up above the sun in an arch, then quickly fell apart as it broke away into space (Mar. 26-27, 2015). These densely structured prominences, usually unstable, are suspended above the sun by magnetic forces. Here they are imaged in a wavelength of extreme ultraviolet light. Amateur astronomers worldwide have been having a wonderful time watching this event unfold. Image Credit: Solar Dynamics Observatory, NASA #nasa #sun #space #sdo #solar #astronomy #science;
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Media photograph the Soyuz TMA-16M spacecraft as it launched to the International Space Station (@ISS) with Expedition 43 NASA Astronaut Scott Kelly (@stationcdrkelly), Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard Saturday, March 28, 2015, Kazakh time (March 27 Eastern time) from the Baikonur Cosmodrome in Kazakhstan. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Image Credit: NASA/Bill Ingalls #nasa #yearinspace #iss #spacestation #astronauts; -
An edge-on view of the spiral galaxy NGC 5023, which lies over 30 million light-years away from us. Due to its orientation seen here by our Hubble Space Telescope, we cannot appreciate its spiral arms, but we can admire the elegant profile of its disk. Astronomers are particularly interested in the vertical structure of disks like these to help understand galaxy evolution. The incredible sharp sight of Hubble has allowed scientist to count more than 30,000 individual bright stars in this image. This is only a small fraction of the several billion stars that this galaxy contains, but the others are too faint to detect individually even with Hubble. Credit: ESA/NASA #nasa #hubble #hubble25 #hst #telescope #space #astronomy #science; -
And Lift Off! At 3:42 p.m. EDT, NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko and Gennady Padalka launched aboard a Soyuz spacecraft to the International Space Station. Kelly and Kornienko will begin a one-year mission in space, testing the limits of human research, space exploration and the human spirit. Most expeditions to the space station last four to six months. By doubling the length of this mission, researchers hope to better understand how the human body reacts and adapts to long-duration spaceflight. This knowledge is critical as NASA looks toward human journeys deeper into the solar system, including to and from Mars, which could last 500 days or longer. It also carries potential benefits for humans here on Earth, from helping patients recover from long periods of bed rest to improving monitoring for people whose bodies are unable to fight infections. Image Credit: NASA/Bill Ingalls #nasa #yearinspace #space #iss #spacestation #journeytomars #science; -
Clues that May Help Identify Dark Matter: Using observations from NASA’s Hubble Space Telescope and Chandra X-ray Observatory, astronomers have found that dark matter does not slow down when colliding with itself, meaning it interacts with itself less than previously thought. Researchers say this finding narrows down the options for what this mysterious substance might be. Dark matter is an invisible matter that makes up most of the mass of the universe. Because dark matter does not reflect, absorb or emit light, it can only be traced indirectly by, such as by measuring how it warps space through gravitational lensing, during which the light from a distant source is magnified and distorted by the gravity of dark matter. Here are images of four different galaxy clusters taken with Hubble (blue) and Chandra (pink) in a study of how dark matter in clusters of galaxies behaves when the clusters collide. A total of 72 large cluster collisions were studied. Image Credit: NASA and ESA #nasa #space #chandra #hubble #hst #hubble25 #astronomy #darkmatter #science; -
Ready to launch astronauts on a one-year mission, the Soyuz TMA-16M spacecraft is seen after having rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Wednesday, March 25, 2015. NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch to the International Space Station in the Soyuz at 3:42 p.m. EDT, Friday, March 27 (March 28, Kazakh time). As the one-year crew, Kelly and Kornienko will return to Earth on the Soyuz TMA-18M in March 2016. This knowledge from the one-year mission is critical as NASA looks toward human journeys deeper into the solar system, including to and from Mars, which could last 500 days or longer. Image Credit: NASA/Bill Ingalls #nasa #iss #spacestation #space #yearinspace #journeytomars #soyuz #science;
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