
NASA astronaut Scott Kelly, Expedition 25 flight engineer, is pictured in the Cupola of the International Space Station on Oct.…

An engineering technician guides a circumferential weld of the “pathfinder” version of the adapter design that will be used on…

Engineers conduct their first circumferential weld of the “pathfinder” version of the adapter design that will be used on test…

A welding technician inspects a circumferential weld of the “pathfinder” version of the adapter design that will be used on…

Planck has discovered a bridge of hot gas that connects galaxy clusters Abell 399 (lower center) and Abell 401 (top…

The sun erupted with two prominence eruptions, one after the other over a four-hour period on Nov. 16, 2012. The…

Seen from the International Space Station, the Soyuz TMA-05M descent module begins to re-enter the Earth’s atmosphere, leaving a plasma…

NASA’s modified Boeing 747 Space Shuttle Carrier Aircraft (SCA) No. 905 retracts its landing gear as it climbs into the…

NASA’s historic Space Shuttle Carrier Aircraft (SCA) No. 905 points its nose skyward after takeoff from Edwards Air Force Base…

The Soyuz TMA-05M spacecraft is seen shortly after it landed with Expedition 33 Commander Sunita Williams of NASA and Japanese…