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Saturn's Moon Dione: Our Cassini spacecraft zipped past Saturn's moon Dione today -- the final close flyby of this icy satellite during the spacecraft's long mission. While not bursting with activity like its system sister Enceladus, the surface of Dione is definitely not boring. Some parts of the surface are covered by linear features, called chasmata, which provide dramatic contrast to the round impact craters that typically cover moons. The bright network of fractures on Dione (698 miles or 1123 kilometers across) was seen originally at poor resolution in Voyager images and was labeled as "wispy terrain." The nature of this terrain was unclear until Cassini showed that they weren't surface deposits of frost, as some had suspected, but rather a pattern of bright icy cliffs among myriad fractures. One possibility is that this stress pattern may be related to Dione's orbital evolution and the effect of tidal stresses over time. Credit: NASA/JPL-Caltech/Space Science Institute #nasa #space #cassini #saturn #dione #moon #astronomy #science #nasabeyond; -
Hubble Sees a "Mess of Stars" - Bursts of pink and red, dark lanes of mottled cosmic dust, and a bright scattering of stars - this Hubble Space Telescope image shows part of a messy barred spiral galaxy known as NGC 428. It lies approximately 48 million light-years away from Earth in the constellation of Cetus (The Sea Monster). Overall NGC 428's spiral structure appears to be quite distorted and warped, thought to be a result of a collision between two galaxies. Image credit: ESA/Hubble and NASA and S. Smartt (Queen's University Belfast) #nasa #hubble #hubble25 #hst #nasabeyond #galaxy #space #stars #astronomy #science; -
The Landsat 8 satellite captured images of algal blooms around the Great Lakes, visible as swirls of green in this image of Lake St. Clair and in western Lake Erie. Earlier in July, NOAA scientists predicted that the 2015 season for harmful algal blooms would be severe in western Lake Erie. Algae in this basin thrive when there is an abundance of nutrients (many from agricultural runoff) and sunlight, as well as warm water temperatures. The season runs through summer and peaks in September. Harmful algal blooms can lead to fish kills. They also can affect the safety of water for recreation and for consumption (as was the case in Toledo, Ohio, and southeast Michigan during a 2014 bloom). As of July 30, 2015, drinking water was reported to be safe in these areas. Image Credit: NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey #nasa #earth #earthrightnow #greatlakes #lakeerie #landsat #noaa #science; -
At 5 p.m. EDT an RS-25 engine roared to life during a 535-second test in which it reached 109% power and burned 150,000 gallons of liquid oxygen and 60,000 gallons of liquid hydrogen. The RS-25 developmental engine reached temperatures of 6,000 degrees Fahrenheit during the firing on the historic A-1 test stand at NASA’s Stennis Space Center in Mississippi. Operators are conducting the test series to qualify an all-new engine controller and put the upgraded former space shuttle main engines through the rigorous temperature and pressure conditions they will experience during a SLS mission. One final test of this RS-25 developmental engine is planned in this series; testing of flight engines begins later this fall. SLS will launch astronauts in the Orion spacecraft on missions to deep space and eventually on the journey to Mars. An initial 70-metric-ton (77-ton) SLS configuration will use four RS-25 engines for the core stage, along with two five-segment solid rocket boosters, providing more lift to orbit than any current launch vehicle. Video credit: NASA #nasa #journeytomars #rs-25 #sls #spacelaunchsystem #mars #space; -
The Perseid meteor shower is caused by debris from Comet Swift-Tuttle as it swings through the inner solar system and ejects a trail of dust and gravel along its orbit. When the Earth passes through the debris, specs of comet-stuff hit the atmosphere at 140,000 mph and disintegrate in flashes of light. Meteors from this comet are called Perseids because they seem to fly out of the constellation Perseus. Last year, this meteor shower peaked during a bright “supermoon”, so visibility was reduced. Luckily, this year, the show was especially awesome because the Moon is nearly new when the shower peaked on Aug. 12-13, 2015. In this 30 second exposure, a meteor streaks across the sky during the annual Perseid meteor shower Aug. 13, 2015, in Spruce Knob, West Virginia. Photo Credit: NASA/Bill Ingalls #perseids #meteorshower #nasa #space #sky #nightsky #perseid #meteors #stars;
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NASA Astronaut Scott Kelly shared this incredible video last night, August 11, showing “our galactic home” with the stars of the Milky Way. Kelly is living and working off the Earth, for the Earth aboard the station for a yearlong mission. Traveling the world more than 220 miles above the Earth, and at 17,500 mph, he circumnavigates the globe more than a dozen times a day conducting research about how the body adapts and changes to living in space for a long duration. Video credit: NASA #nasa #spacestation @iss #iss #milkyway #space #stars #nightsky #sky; -
Darkness descending... Saturn's unusual appearance in this picture is a result of the planet being imaged via an infrared filter. Infrared images can help scientists determine the location of clouds in the planet's atmosphere. In this image, Cassini's wide-angle camera used a filter which is especially sensitive to infrared wavelengths that are absorbed by methane. Methane is not a major component of Saturn's atmosphere, but enough of it is present to make a difference in how much light is reflected by different clouds. The darker areas reveal clouds that are lower in the atmosphere, therefore under more methane. Bright areas on Saturn are higher altitude clouds. Scientists think that these lower-altitude clouds are in regions where "air" is descending while the higher-altitude clouds are in regions where air is rising. Thus, images like this one can help us map the vertical air movements on Saturn. Credit: NASA/JPL-Caltech/Space Science Institute #nasa #nasabeyond #cassini #space #solarsystem #saturn #science; -
That’s one small bite for a man, one giant leaf for mankind: Today, astronauts Scott Kelly, Kjell Lindgren and Kimiya Yui of Japan sample the fruits of their labor after harvesting a crop of “Outredgeous” red romaine lettuce from the Veggie plant growth system on the International Space Station. They are the first people to eat food grown in space. We’re maturing Veggie technology aboard the space station to provide future pioneers with a sustainable food supplement – a critical part of our Journey to Mars. As we move toward long-duration exploration missions farther into the solar system, Veggie will be a resource for crew food growth and consumption. It also could be used by astronauts for recreational gardening activities during deep space missions. Credit: NASA #iss space spacestation nasa journeytomars yearinspace; -
Before drifting off to sleep tonight aboard the International Space Station, astronaut Scott Kelly (@stationcdrkelly) posted this image and wrote, "Day 135. #MilkyWay. You're old, dusty, gassy and warped. But beautiful. Good night from @ISS! #YearInSpace" Kelly is living and working off the Earth, for the Earth aboard the station for a yearlong mission. Traveling the world more than 220 miles above the Earth, and at 17,500 mph, he circumnavigates the globe more than a dozen times a day. Image Credit: NASA #nasa #iss #spacestation #space #isscrew; -
Hubble Finds a Little Gem: This colorful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. It is located in the constellation of Sagittarius (The Archer), roughly 6,000 light-years away from us. The rich glow of the cloud is just over half a light-year across - humongous compared to its tiny central star - but still a little gem on a cosmic scale. Image credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt #nasa #hubble #hst #hubble25 #nasabeyond #space #nebula #science;
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Aboard the International Space Station, astronaut Scott Kelly (@stationcdrkelly) posted this image and wrote, "The view out my window this morning. #Typhoon #Soudelor still looking ominous from @ISS. #YearInSpace." Clouds in Typhoon Soudelor's western quadrant were already spreading over Taiwan early on Aug. 7. Soudelor is expected to make landfall and cross central Taiwan today and make a second landfall in eastern China. Image Credit: NASA #nasa #iss #spacestation #space #storm; -
Stormy Seas in Sagittarius: Some of the most breathtaking views in the Universe are created by nebulae - hot, glowing clouds of gas. This new NASA/ESA Hubble Space Telescope image shows the center of the Lagoon Nebula, an object with a deceptively tranquil name, in the constellation of Sagittarius. The region is filled with intense winds from hot stars, churning funnels of gas, and energetic star formation, all embedded within an intricate haze of gas and pitch-dark dust. Image Credit: NASA, ESA, J. Trauger (Jet Propulson Laboratory) #nasa #hubble #hst #hubble25 #nasabeyond #space #nebula #science; -
The far side of the moon, illuminated by the sun, is seen as it crosses between our 'EPIC' camera on the Deep Space Climate Observatory (DSCOVR) satellite, and the Earth - one million miles away. This image was captured by NASA's Earth Polychromatic Imaging Camera (EPIC), a four megapixel CCD camera and telescope on the DSCOVR satellite orbiting 1 million miles from Earth. From its position between the sun and Earth, DSCOVR conducts its primary mission of real-time solar wind monitoring for the National Oceanic and Atmospheric Administration (NOAA). Image credit: NASA/NOAA #nasa #dscovr #satellite #moon #earth #millionmiles #space @NOAA #epic #lunar; -
The largest and most powerful hurricanes ever recorded on Earth spanned over 1,000 miles across with winds gusting up to around 200 mph. That's wide enough to stretch across nearly all U.S. states east of Texas. But even that kind of storm is dwarfed by the Great Red Spot, a gigantic storm in Jupiter. There, gigantic means twice as wide as Earth. With tumultuous winds peaking at about 400 mph, the Great Red Spot has been swirling wildly over Jupiter's skies for the past 150 years-maybe even much longer than that. While people saw a big spot in Jupiter as early as they started stargazing through telescopes in the 1600s, it is still unclear whether they were looking at a different storm. Today, scientists know the Great Red Spot is there and it's been there for a while, but they still struggle to learn what causes its swirl of reddish hues. Image Credit: NASA #nasa #space #jupiter #earth #nasabeyond #science; -
Streaming Push and Pull: Elongated streams of plasma zipped back and forth along magnetic field lines above several active regions on the sun on July 26-27, 2015. This kind of activity is rather common, but interesting to watch up close as the streams of particles twist and turn and zip back and forth. The images were taken of ionized Helium heated to 60,000 degrees C. in 304 wavelength of extreme ultraviolet light. Credit: NASA/Solar Dynamics Observatory/Steele Hill. #nasa #sdo #sun #space #nasabeyond #science;
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