NASA astronaut and NEEMO 20 aquanaut Serena Aunon moves equipment underwater during the 14-day undersea mission.
International Space Station astronauts captured this photo of Earth's atmospheric layers on July 31, 2011, revealing the troposp
At the Kennedy Space Center in Florida, NASA officials and Apollo astronauts tour the refurbished Operations and Checkout Buildi
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.
A perigee full moon, or supermoon, is seen next to the Empire State Building at the beginning of a total lunar eclipse, Sunday,
The arrangement of spiral arms in the galaxy Messier 63 recall the pattern at the center of a sunflower
Nighttime photograph of lights on Earth with HTV cargo vehicle on space station in foreground and moon and Venus visible
This poster shows a flattened (Mercator) projection of the view from the descent imager/spectral radiometer on the European Spac
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
This illustration shows a glowing stream of material from a star as it is being devoured by a supermassive black hole
In this 30 second exposure, a meteor streaks across the sky during the annual Perseid meteor shower Friday, Aug. 12, 2016 in Spr
Former NASA astronaut Scott Kelly speaks at event, with backdrop showing photograph of aurora from space
The sun rises as the Soyuz TMA-14M spacecraft is rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, S
Astronaut James H. Newman waves during a spacewalk preparing for release of the first combined elements of the International Spa