NASA astronaut and NEEMO 20 aquanaut Serena Aunon moves equipment underwater during the 14-day undersea mission.
This poster shows a flattened (Mercator) projection of the view from the descent imager/spectral radiometer on the European Spac
A second full moon for the month of July is seen next to the dome of the U.S. Capitol on Friday, July 31, 2015.
At the Kennedy Space Center in Florida, NASA officials and Apollo astronauts tour the refurbished Operations and Checkout Buildi
International Space Station astronauts captured this photo of Earth's atmospheric layers on July 31, 2011, revealing the troposp
A perigee full moon, or supermoon, is seen next to the Empire State Building at the beginning of a total lunar eclipse, Sunday,
Nighttime photograph of lights on Earth with HTV cargo vehicle on space station in foreground and moon and Venus visible
The arrangement of spiral arms in the galaxy Messier 63 recall the pattern at the center of a sunflower
This image, taken on June 30, 2004 during Cassini's orbital insertion at Saturn, shows, from left to right, the outer portion of
The Soyuz MS-01 spacecraft is raised vertical after it was rolled out by train to the launch pad at the Baikonur Cosmodrome, Kaz
Former NASA astronaut Scott Kelly speaks at event, with backdrop showing photograph of aurora from space
In this 30 second exposure, a meteor streaks across the sky during the annual Perseid meteor shower Friday, Aug. 12, 2016 in Spr
This illustration shows a glowing stream of material from a star as it is being devoured by a supermassive black hole
国际空间站释放出了两个立方体卫星，可以看到空间站的太阳帆，下方是地球(Two Cubesats in space moments after release with space station solar array visible and Earth below)