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Giant Landform on Mars: Sandy landforms formed by the wind, or aeolian bedforms, are classified by the wavelength--or length--between crests. On Mars, we can observe four classes of bedforms (in order of increasing wavelengths): ripples, transverse aeolian ridges (known as TARs), dunes, and what are called “draa.” All of these are visible in this Juventae Chasma image. Here, this giant draa possesses steep faces or slip faces several hundreds of meters tall and has lower-order superposed bedforms, such as ripples and dunes. A bedform this size likely formed over thousands of Mars years, probably longer. Image Credit: NASA/JPL/University of Arizona #hirise #nasa #mars #marscuriosity #msl #planets #science; -
With the #BelmontStakes this Saturday and the #NBAFinals heating up, let's Throwback Thursday to one of the tallest and one of the shortest professional athletes finding a middle ground on the topic of space technology. They mention scratch-resistant lenses, a popular NASA spinoff. It's a technology, originally developed to meet NASA mission needs, that has been transferred to the public and now provides benefits for the nation and world as a commercial product or service. Video credit: NASA #tbt #321TechOff #BelmontStakes #NBAFinals #throwbackthursday #vintage #history #nasahistory @kaj33; -
NASA Technology: As we prepare for the Low-Density Supersonic Decelerator (LDSD) experimental flight test in Hawaii, now set to launch no earlier than June 7, the agency continues work on other entry, descent and landing technologies. As seen in this image, technicians prepare the Hypersonic Inflatable Aerodynamic Decelerator (HIAD) for structural loads testing beginning in mid-2013 at our Armstrong's Flight Loads Laboratory. The donut-shaped, inflatable test article is designed to more effectively slow down a spacecraft upon atmospheric re-entry to Earth or other planets. Image credit: NASA #321techoff #nasaarmstrong #nasatech #nasa #technology #ldsd #hiad; -
High Vortex: Titan's polar vortex stands illuminated where all else is in shadow. Scientists deduce that the vortex must extend higher into Titan's atmosphere than the surrounding clouds because it is still lit in images like this. Although the south polar region is now in winter, the Sun can still reach high features like the vortex. Titan (3,200 miles, or 5,150 kilometers across) is Saturn's largest moon. This view looks toward the Saturn-facing hemisphere of Titan. The image was taken with the Cassini spacecraft wide-angle camera on Feb. 3 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 742 nanometers. The view was obtained at a distance of approximately 134,000 miles (215,000 kilometers) from Titan. Credit: NASA/JPL-Caltech/Space Science Institute #cassini #nasa #space #moon #saturn #titan #science; -
New Suspect Identified in Supernova Explosion: Supernovas are often thought of as tremendous explosions that mark the ends of massive stars' lives, but not all supernovas occur in this fashion. A common supernova class, Type Ia, involves the detonation of white dwarfs -- small, dense stars that are already dead. New results from our Spitzer Space Telescope have revealed a rare example of Type Ia explosion, in which a dead star "fed" off an aging star like a cosmic zombie, triggering a blast. The results help researchers piece together how these powerful and diverse events occur. Image credit: NASA/JPL-Caltech/Goddard #nasa #spitzer #supernova #astronomy #stars #telescope #science;
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The most colorful view of universe captured: Astronomers using our Hubble Space Telescope have assembled a comprehensive picture of the evolving universe – among the most colorful deep space images ever captured by the 24-year-old telescope. This image -- made from 841 orbits of telescope viewing time -- contains approximately 10,000 galaxies, extending back in time to within a few hundred million years of the big bang. This is a composite image showing the visible and near infrared light spectrum collected from Hubble's ACS and WFC3 instruments over a nine-year period. Image Credit: NASA/ESA #nasa #hst #hubble #space #astronomy #galaxy #universe #stars #telescope #science; -
We captured an image of a galaxy sparkling in X-rays: Nearly a million seconds of observing time with our Chandra X-ray Observatory has revealed a spiral galaxy similar to the Milky Way glittering with hundreds of X-ray points of light. The galaxy is officially named Messier 51 (M51) or NGC 5194, but often goes by its nickname of the “Whirlpool Galaxy.” Like the Milky Way, the Whirlpool is a spiral galaxy with spectacular arms of stars and dust. M51 is located 30 million light years from Earth, and its face-on orientation to Earth gives us a perspective that we can never get of our own spiral galactic home. Much of the diffuse, or fuzzy, X-ray emission in M51 comes from gas that has been superheated by supernova explosions of massive stars. Image Credit: NASA #nasa #chandra #galaxy #xray #milkyway #space #astronomy #science; -
How we build a space laser: To build a satellite that will measure all the bumps and dips of our dynamic Earth, engineers started with a black box, built of a composite honeycomb material to make it as light as possible. The structure was precisely manufactured with an opening to allow lasers to beam to Earth, and other windows sized for a telescope that will capture photons that bounce off our planet and return to the satellite. The box was measured and marked to denote where the assembly of aligned mirrors, electronics, lasers and photon detectors would be attached. ICESat-2’s Advanced Topographic Laser Altimeter System, or ATLAS, will measure the elevation of Earth’s surfaces, from ice sheets to forests to oceans. Its six laser beams will generate a more detailed elevation portrait than single beam of original ICESat, which flew from 2003 to 2009. And with the beams paired, scientists will be able to measure surface slope and better calculate height changes. To measure elevation, ATLAS beams light with a green laser that pulses 10,000 times a second. Only a few photons will bounce off the surface and return to the satellite, but an incredibly sensitive detector counts those that do come back. Using the time of the photons’ return trip, the speed of light and some geometry, scientists can determine the distance the photons traveled and, therefore, the height of Earth below the satellite’s orbit. This image is an artist's concept shows a representation of ICESat-2 and its six-beam scanning pattern. Image credit: NASA's Goddard Space Flight Center #EarthRightNow #TechTuesday #321TechOff @nasagoddard #nasa #space #icesat; -
Astronomers Confounded By Massive Rocky World - Astronomers have discovered a rocky planet that weighs 17 times as much as Earth and is more than twice as large in size. This discovery has planet formation theorists challenged to explain how such a world could have formed. Worlds such as this were not thought possible to exist. The enormous gravitational force of such a massive body would accrete a gas envelope during formation, ballooning the planet to a gas giant the size of Neptune or even Jupiter. However, this planet is thought to be solid, composed primarily of rock. This image is an artist concept that shows the Kepler-10 system, home to two rocky planets. In the foreground is Kepler-10c, a planet that weighs 17 times as much as Earth and is more than twice as large in size. Image Credit: Harvard-Smithsonian Center for Astrophysics/David Aguilar #planets #nasa #kepler #astronomy #science #exoplanet #earth; -
Venice Lagoon - A narrow barrier island protects the Lagoon of Venice from storm waves in the northern Adriatic Sea, and breakwaters protect inlets to the lagoon. Red tiles on the roofs of Venice contrast with the grays of the sister city of Mestre, and the cities are joined by a prominent causeway. What appears to be another causeway joining the island to the airport (top right) is actually the combined wakes of many boats and water taxis shuttling between them. Small, bright agricultural fields on well-drained soils (top left) contrast with the darker vegetation of back-bay swamps, where fishing is a popular pastime. The image was taken by the space station's Expedition 39 crew. It has been cropped and enhanced to improve contrast, and lens artifacts have been removed. Image Credit: NASA #nasa #iss #italy #venice #spacestation #space #adriatic #exp39;
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As seen on #Cosmos: The Apollo 8 mission, first time humans left Earth orbit. This view of the rising Earth greeted the Apollo 8 astronauts as they came from behind the Moon after the lunar orbit insertion burn. Earth is about five degrees above the horizon in the photo. The unnamed surface features in the foreground are near the eastern limb of the Moon as viewed from Earth. The lunar horizon is approximately 780 kilometers from the spacecraft. Width of the photographed area at the horizon is about 175 kilometers. On the Earth 240,000 miles away, the sunset terminator bisects Africa. Image Credit: NASA #nasa #cosmos #earth #earthrightnow #apollo8 #watching cosmos #moon; -
As seen on Cosmos: Solar energy - The Sun’s surface temperature is 5,500° C, and its peak radiation is in visible wavelengths of light. Earth’s effective temperature—the temperature it appears when viewed from space—is -20° C, and it radiates energy that peaks in thermal infrared wavelengths. (Illustration adapted from Robert Rohde.) Incandescent light bulbs radiate 40 to 100 watts. The Sun delivers 1,360 watts per square meter. An astronaut facing the Sun has a surface area of about 0.85 square meters, so he or she receives energy equivalent to 19 60-watt light bulbs. Image Credit: NASA #earth #nasa #earthrightnow #sun #solarenergy #energy #cosmos #watchingcosmos; -
As seen on Cosmos: Volcanoes! Although volcanoes are active around the world, and continue to emit carbon dioxide as they did in the past, the amount of carbon dioxide they release is extremely small compared to human emissions. On average, volcanoes emit between 130 and 230 million tonnes of carbon dioxide per year. By burning fossil fuels, people release in excess of 100 times more, about 26 billion tonnes of carbon dioxide, into the atmosphere every year (as of 2005). This image shot by astronauts aboard the International Space Station is a striking view of Sarychev volcano (Russia's Kuril Islands, northeast of Japan) in an early stage of eruption on June 12, 2009. Sarychev Peak is one of the most active volcanoes in the Kuril Island chain and is located on the northwestern end of Matua Island. Image Credit: NASA #nasa #earthrightnow #earth #iss #spacestation #volcano #science #cosmos #watchingcosmos; -
As seen on #Cosmos: Earth’s atmosphere, an extremely thin sheet of air from Earth's surface to the edge of space. The Earth is a sphere with a roughly 8000 mile diameter; the thickness of the atmosphere is about 60 miles. In this picture, taken from a spacecraft orbiting at 200 miles above the surface, we can see the atmosphere as the thin blue band between the surface and the blackness of space. If the Earth were the size of a basketball, the thickness of the atmosphere could be modeled by a thin sheet of plastic wrapped around the ball. Gravity holds the atmosphere to the Earth's surface. Within the atmosphere, very complex chemical, thermodynamic, and fluid dynamics effects occur. The atmosphere is not uniform; fluid properties are constantly changing with time and location. Image Credit: NASA #nasa #climate #earth #earthrightnow #cosmos #watchingcosmos; -
As seen on Cosmos: Venus! The forecast for Venus is cloudy, cloudy, cloudy. The dense carbon dioxide atmosphere of Venus shrouds the planet in a thick layer of clouds—and heats the surface to a scorching 460° C (860° F). Although similar to the Earth in size and mass, Venus' slightly closer orbit to the sun create for it a much thicker atmosphere and a much hotter surface. The thick atmosphere was photographed above in ultraviolet light in 1979 by the Pioneer Venus Orbiter. Venus's extremely uncomfortable climate was likely caused by a runaway greenhouse effect. Image Credit: NASA #nasa #venus #planets #climate #cosmos #watchingcosmos;
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