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Retreating Glacier: Located in the Brabazon Range of southeastern Alaska, Yakutat Glacier is one of the fastest retreating glaciers in the world. It is the primary outlet for the 810-square kilometer (310-square mile) Yakutat ice field, which drains into Harlequin Lake and, ultimately, the Gulf of Alaska. The Operational Land Imager on the Landsat 8 satellite captured this image of the glacier and lake on Aug. 13, 2013. Snow and ice appear white and forests are green. The brown streaks on the glaciers are lateral and medial moraines. Over the past 26 years, the glacier’s terminus has retreated more than 5 kilometers (3 miles). What is causing the rapid retreat? University of Alaska glaciologist Martin Truffer and colleagues pointed to a number of factors in their 2013 study published in the Journal of Glaciology. The chief cause is the long-term contraction of the Yakutat Ice Field, which has been shrinking since the height of the Little Ice Age. Image Credit: NASA Earth Observatory image by Robert Simmon, using Landsat data from the U.S. Geological Survey #earth #earthrightnow #climatechange #ice #glacier #nasa #science; -
Dancing Auroras! Astronaut Reid Wiseman on the International Space Station snapped with image of auroras over Earth and stated, "Never in my wildest dreams did I imagine this." The dancing lights of the aurora provide spectacular views on the ground and from the space station, but also capture the imagination of scientists who study incoming energy and particles from the sun. Aurora are one effect of such energetic particles, which can speed out from the sun both in a steady stream called the solar wind and due to giant eruptions known as coronal mass ejections. Image Credit: NASA #iss #aurora #exp40 #spacestation #space #nasa; -
The launch of more miniature satellites and cleanup activities were the focus of activities Tuesday aboard the orbiting International Space Station. This image is of a pair of Planet Labs Dove satellites that were deployed Tuesday in the first of the latest series of NanoRacks CubeSat deployments from the space station. Image Credit: NASA #nasa #space #spacestation #iss #exp40 #satellite #cudesat #science; -
Testing Electric Propulsion: On August 19, National Aviation Day, a lot of people are reflecting on how far aviation has come in the last century. Could this be the future – a plane with many electric motors that can hover like a helicopter and fly like a plane, and that could revolutionize air travel? Engineers at NASA's Langley Research Center in Hampton, Va., are studying the concept with models such as the unmanned aerial system GL-10 Greased Lightning. The GL-10, which has a 10-foot wingspan, recently flew successfully while tethered. Free-flight tests are planned in the fall of 2014. Today, share your first flight experience with images and stories using #myfirstflight. Image Credit: NASA Langley/David C. Bowman #nasa #nationalaviationday #nasaaero #aeronautics; -
National Aviation Day is today! We're remembering 'first flights.' Share yours on social media with stories and images using #myfirstflight. In honor of the Wright brother's first flight, President Franklin Roosevelt declared in 1939 that Aug. 19, Orville Wright's birthday, would be National Aviation Day - an annual occasion to celebrate the importance of aviation. In this photo, research pilot Denis Steele sets up a camera in the cockpit of an ER-2 aircraft at 65,000 feet over the Alaskan mountains. Image Credit: NASA / Denis Steele #nasa #nationalaviationday #nasaaero #aeronautics;
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Curiosity's Brushwork on Martian 'Bonanza King' Target: Our Curiosity Mars rover used the Dust Removal Tool on its robotic arm to brush aside reddish, more-oxidized dust, revealing a gray patch of less-oxidized rock material at a target called "Bonanza King," visible in this image from the rover's Mast Camera. The rover team is evaluating Bonanza King as a possible drilling target. The mission has previously drilled into three target rocks to collect sample powder for analysis by the rover's onboard laboratory instruments. Image Credit: NASA/JPL-Caltech/MSSS #nasa #mars #marscuriosity #marsrover #planets #science; -
Ring King: Saturn reigns supreme, encircled by its retinue of rings. Although all four giant planets have ring systems, Saturn's is by far the most massive and impressive. Scientists are trying to understand why by studying how the rings have formed and how they have evolved over time. This view looks toward the sunlit side of the rings from about 37 degrees above the ringplane. The image was taken with the Cassini spacecraft wide-angle camera on May 4, 2014 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 752 nanometers. Credit: NASA/JPL-Caltech/Space Science Institute #nasa #saturn #cassini #space planets #science; -
This new NASA/ESA Hubble Space Telescope image shows a whole host of colorful and differently shaped galaxies; some bright and nearby, some fuzzy, and some so far from us they appear as small specks in the background sky. Together they appear as kind of galactic soup. The most prominent characters are the two galaxies on the left — 2MASX J16133219+5103436 at the bottom, and its blue-tinted companion SDSS J161330.18+510335 at the top. The latter is slightly closer to us than its partner, but the two are still near enough to one another to interact. Together, the two make up a galactic pair named Zw I 136. Both galaxies in this pair have disturbed shapes and extended soft halos. They don’t seem to conform to our view of a “typical” galaxy — unlike the third bright object in this frame, a side-on spiral seen towards the right of the image. Astronomers classify galaxies according to their appearance and their shape. The most famous classification scheme is known as the Hubble sequence, devised by its namesake Edwin Hubble. One of the great questions in galaxy evolution is how interactions between galaxies trigger waves of star formation, and why these stars then abruptly stop forming. Interacting pairs like this one present astronomers with perfect opportunities to investigate this. Image credit: ESA/Hubble & NASA Acknowledgement: Judy Schmidt #hubble #nasa #esa #galaxy #galaxies #space; -
As Seen by Rosetta: Comet Surface Variations: This new image of comet 67P/Churyumov-Gerasimenko shows the diversity of surface structures on the comet's nucleus. It was taken by the Rosetta spacecraft's OSIRIS narrow-angle camera on Aug. 7, 2014. At the time, the spacecraft was 65 miles (104 kilometers) away from the 2.5-mile-wide (4-kilometer) nucleus. In the image, the comet's head (in the top half of the image) exhibits parallel linear features that resemble cliffs, and its neck displays scattered boulders on a relatively smooth, slumping surface. In comparison, the comet's body (lower half of the image) seems to exhibit a multi-variable terrain with peaks and valleys, and both smooth and rough topographic features. Image Credit: ESA/Rosetta/NAVCAM #esa #rosetta #space #comet #nasa #cometwatch #67P; -
The U.S. Gulf Coast at Night: One of the Expedition 40 crew members aboard the International Space Station photographed this nighttime image showing city lights in at least half a dozen southern states from some 225 miles above the home planet. Lights from areas in the Gulf Coast states of Texas, Louisiana, Mississippi and Alabama, as well as some of the states that border them on the north, are visible. Image Credit: NASA #iss #nasa #space #spacestation #exp40 #gulfcoast;
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Aboard the International Space Station, NASA astronaut Reid Wiseman caught volcanoes Etna & Stromboli erupting by day & European Space Agency astronaut Alexander Gerst snapped the same shot at night. Wiseman tweeted his image and wrote, "#Etna and #Stromboli erupting by day. @astro_alex took the exact same shot at night, with lava. #teamwork." And Gerst wrote, "You can see the red glowing lava of 2 volcanoes on this photo! Spot them on @astro_reid's day photo! #teamwork." Image Credit: NASA #space #iss #nasa #spacestation #exp40 #esa; -
A wealth of images of Earth at night taken by astronauts on the International Space Station (ISS) could help save energy, contribute to better human health and safety and improve our understanding of atmospheric chemistry. But scientists need your help to make that happen. The pictures are clear, but their location may not be, which limits their usefulness. That's where citizen science comes in. Visit this link for more information: go.nasa.gov/1nT4OQg The Iberian Peninsula at night, showing Spain and Portugal. Madrid is the bright spot just above the center. Image Credit: NASA #nasa #space #spacestation #iss #science #exp40; -
Supernova Explodes! New data from our Chandra X-ray Observatory has provided stringent constraints on the environment around one of the closest supernovas discovered in decades. The Chandra results provide insight into possible cause of the explosion. On Jan. 21, 2014, astronomers witnessed a supernova soon after it exploded in the Messier 82, or M82, galaxy. Telescopes across the globe and in space turned their attention to study this newly exploded star, including Chandra. Astronomers determined that this supernova, dubbed SN 2014J, belongs to a class of explosions called "Type Ia" supernovas. These supernovas are used as cosmic distance-markers and played a key role in the discovery of the Universe's accelerated expansion, which has been attributed to the effects of dark energy. Scientists think that all Type Ia supernovas involve the detonation of a white dwarf. One important question is whether the fuse on the explosion is lit when the white dwarf pulls too much material from a companion star like the sun, or when two white dwarf stars merge. This image contains Chandra data, where low, medium, and high-energy X-rays are red, green, and blue respectively. Image Credit: NASA/CXC/SAO/R.Margutti et al #nasa #astronomy #space #supernova #chandra #telescope ##science; -
Moon from Space: Aboard the International Space Station, astronaut Reid Wiseman snapped this image and posted it to Twitter. He wrote, "I missed the #supermoon but it still looked great setting today!" Image Credit: NASA #nasa #exp40 #iss #spacestation #space moon #earth; -
Tall Boulder Rolls Down Martian Hill, Lands Upright: The track left by an oblong boulder as it tumbled down a slope on Mars runs from upper left to right center of this image. The boulder came to rest in an upright attitude at the downhill end of the track. The HiRISE camera on our Mars Reconnaissance Orbiter recorded this view on July 14, 2014. Image Credit: NASA/JPL-Caltech/Univ. of Arizona #nasa #mars #mro #hirise #planets #solarsystem #geology #science;
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