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In this Feb. 7, 1984 photograph taken by his fellow crewmembers aboard the Earth-orbiting Space Shuttle Challenger on the STS-41B mission, NASA astronaut Bruce McCandless II approaches his maximum distance from the vehicle. McCandless became the first astronaut to maneuver about in space untethered, during this first "field" tryout of a nitrogen-propelled, hand-controlled backpack device called the Manned Maneuvering Unit. For 50 years, NASA has been "suiting up" for spacewalking. The first American to conduct a spacewalk, astronaut Edward H. White II, floated into the vastness of space on the Gemini IV mission on June 3, 1965. Image Credit: NASA #nasa #space #eva #spacewalk #geminiiv #otd #spaceshuttle #history #suitup; -
50 years ago today, astronaut Ed White floated out of the Gemini IV spacecraft to become the first American to walk in space during the first Mission Controlled from Houston's manned spacecraft center. In this image, White floats in the microgravity of space outside the Gemini IV spacecraft. Behind him is the brilliant blue Earth and its white cloud cover. White is wearing a specially-designed space suit. The visor of the helmet is gold plated to protect him against the unfiltered rays of the sun. In his left hand is a Hand-Held Self-Maneuvering Unit with which he controls his movements in space. Credits: NASA/Jim McDivitt #nasa #space #gemini #otd #spacewalk #eva #spacewalk50 #suitup #missioncontrol #houston; -
NASA's Cassini imaging scientists processed this view of Saturn's moon Hyperion, taken during a close flyby on May 31, 2015. This flyby marks the mission's final close approach to Saturn's largest irregularly shaped moon. North on Hyperion is up and rotated 55 degrees to the left. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 31, 2015. The view was acquired at a distance of approximately 24,000 miles (38,000 kilometers) from Hyperion and at a Sun-Hyperion-spacecraft, or phase, angle of 46 degrees. Image scale is 145 feet (230 meters) per pixel. Image Credit: NASA/JPL-Caltech/Space Science Institute #nasa #space #cassini #saturn #moon #hyperion; -
A billowing plume of steam signals a successful 450-second test of the RS-25 rocket engine May 28 at our Stennis Space Center near Bay St. Louis, Mississippi. The hotfire test was conducted on the historic A-1 Test Stand where Apollo Program rocket stages and Space Shuttle Program main engines also were tested. RS-25 engines tested on the stand will power the core stage of our new rocket, the Space Launch System (SLS), which is being developed to carry humans deeper into space than ever before. Credit: NASA #journeytomars #sls #nasa #space #test #rs25; -
Aboard the International Space Station, astronaut @Astro_Terry Virts posted this time-lapse video and wrote, "Our spectacular universe! Look closely and you can see two satellites streaking across the sky." Image Credit: NASA #space #iss #nasa #spacestation #astronauts #earth;
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A team of astronomers using the Hubble Space Telescope found an unambiguous link between the presence of supermassive black holes that power high-speed, radio-signal-emitting jets and the merger history of their host galaxies. Almost all galaxies with the jets were found to be merging with another galaxy, or to have done so recently. The team studied a large selection of galaxies with extremely luminous centers - known as active galactic nuclei - thought to be the result of large quantities of heated matter circling around and being consumed by a supermassive black hole. While most galaxies are thought to host supermassive black holes, only a small percentage of them are this luminous and fewer still go one step further and form what are known as relativistic jets. The two high-speed jets of plasma move almost at the speed of light and stream out in opposite directions at right angles to the disc of matter surrounding the black hole, extending thousands of light-years into space. Image credit: NASA/ESA/STScI #nasa #astronomy #space #hubble #hubble25 #hst #esa #blackhole #galaxy #science; -
Sparkling cities below the International Space Station are haloed by an aurora on the Earth's horizon on May 26, 2015. Crew members of Expedition 43 took this image of another day beginning from the vantage point of the International Space station and its crew, high above. Image Credit: NASA #nasa #space #iss #exp43 #spacestation #earth; -
Arches Cluster, the densest known star cluster in the Milky Way, is located about 25,000 light-years from Earth in the constellation of Sagittarius (The Archer), close to the heart of our galaxy, the Milky Way. It's a fairly young astronomical object at between two and four million years old. The Arches cluster is so dense that in a region with a radius equal to the distance between the sun and its nearest star there would be over 100,000 stars! At least 150 stars within the cluster are among the brightest ever discovered in the Milky Way. These stars are so bright and massive that they will burn their fuel within a short time (on a cosmological scale that means just a few million years). Then they will die in spectacular supernova explosions. Due to the short lifetime of the stars in the cluster the gas between the stars contains an unusually high amount of heavier elements, which were produced by earlier generations of stars. Image credit: NASA/ESA #nasa #space #milkyway #galaxy #stars #nasabeyond #science; -
For the first time, an international team of scientists have predicted that colorful, glowing aurorae can be seen by the naked eye on a terrestrial planet other than Earth — Mars. Visible Martian aurorae were confirmed in March 2015 by the our MAVEN mission, which completed 1,000 orbits around the red planet on April 6, 2015. The Planeterella simulates aurorae using a magnetic field, charged particles and a sphere. For this study, they replaced the terrestrial atmospheric gas with CO2, the major component of the Martian atmosphere, and then created a discharge in a vacuum similar to Mars’ upper atmosphere. Credits: D. Bernard/IPAG — CNRS #mars #space #nasa #aurora #maven #esa #science; -
New images of huge filamentary structures of gas and dust from the Herschel space observatory reveal how matter is distributed across our Milky Way galaxy. Long and flimsy threads emerge from a twisted mix of material, taking on complex shapes. This image shows a filament called G49, which contains 80,000 suns' worth of mass. This huge but slender structure of gas and dust extends about 280 light-years in length, while its diameter is only about 5 light-years across. In the densest and coolest clumps, the seeds of new generations of stars are taking shape. A brighter clump of matter is visible at the left tip of the wispy thread. This filament is about 18,000 light-years away. The image is oriented with northeast toward the left of the image and southwest toward the right. Image credit: ESA/Herschel/PACS/SPIRE/Ke Wang et al. 2015 #nasa #esa #herschel #space #galaxy #milkyway science;
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This 12-frame mosaic provides the highest resolution view ever obtained of the side of Jupiter's moon Europa that faces the giant planet. It was obtained on Nov. 25, 1999 by the camera onboard the Galileo spacecraft, a past NASA mission to Jupiter and its moons which ended in 2003. Today, we selected nine science instruments for a mission to Jupiter's moon Europa, to investigate whether the mysterious icy moon could harbor conditions suitable for life. The Galileo mission yielded strong evidence that Europa, about the size of Earth's moon, has an ocean beneath a frozen crust of unknown thickness. If proven to exist, this global ocean could have more than twice as much water as Earth. With abundant salt water, a rocky sea floor, and the energy and chemistry provided by tidal heating, Europa could be the best place in the solar system to look for present day life beyond our home planet. Image Credit: NASA/JPL/University of Arizona #nasa #nasabeyond #europa #jupiter #moon #planet #science; -
Today we remember and honor the brave men and women who made the ultimate sacrifice in service to our country. #MemorialDay; -
Astronaut Terry Virts (@Astro_Terry), aboard the International Space Station (@ISS), shared this picture earlier today, stating this was "the view of our Galaxy from space." Normally, the reason you can't see stars in high oblique photos from the space station is that the shutter speed is too fast. Fast shutter speeds are used to eliminate blur from the motion of the orbiting outpost. One exception to this rule is when astronauts use camera settings specifically to photograph features such as the Aurora and the Milky Way. The crew must use slower shutter speeds in order to capture the light of the aurora. In these cases stars also show up in the photograph. The photos are also slightly blurry because very long exposures are needed to capture these dim nighttime features. Image credit: NASA #nasa #space #iss @iss #spacestation @astro_terry #milkyway #galaxy #astropics #astropix; -
Coronal Loops Over a Sunspot Group The Atmospheric Imaging Assembly (AIA) instrument aboard NASA's Solar Dynamics Observatory (SDO) images the solar atmosphere in multiple wavelengths to link changes in the surface to interior changes. Its data includes images of the sun in 10 wavelengths every 10 seconds. When AIA images are sharpened a bit, such as this AIA 171Å channel image, the magnetic field can be readily visualized through the bright, thin strands that are called "coronal loops". Loops are shown here in a blended overlay with the magnetic field as measured with SDO's Helioseismic and Magnetic Imager underneath. Blue and yellow represent the opposite polarities of the magnetic field. The combined images were taken on Oct. 24, 2014, at 23:50:37 UT. Image Credit: NASA SDO #nasa #sdo #sun #coronalloops #solar #space #solardynamics; -
Astronomers using NASA’s Hubble Space Telescope have uncovered surprising new clues about a hefty, rapidly aging star whose behavior has never been seen before in our Milky Way galaxy. In fact, the star is so weird that astronomers have nicknamed it “Nasty 1,” a play on its catalog name of NaSt1. The star may represent a brief transitory stage in the evolution of extremely massive stars. First discovered several decades ago, Nasty 1 was identified as a Wolf-Rayet star, a rapidly evolving star that is much more massive than our sun. The star loses its hydrogen-filled outer layers quickly, exposing its super-hot and extremely bright helium-burning core. But Nasty 1 doesn’t look like a typical Wolf-Rayet star. The astronomers using Hubble had expected to see twin lobes of gas flowing from opposite sides of the star, perhaps similar to those emanating from the massive star Eta Carinae, which is a Wolf-Rayet candidate. Instead, Hubble revealed a pancake-shaped disk of gas encircling the star. The vast disk is nearly 2 trillion miles wide, and may have formed from an unseen companion star that snacked on the outer envelope of the newly formed Wolf-Rayet. Based on current estimates, the nebula surrounding the stars is just a few thousand years old, and as close as 3,000 light-years from Earth. Credits: NASA/Hubble #hubble #hst #nasa #space #nasty1 #wolfrayet #star #stars;
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