Space Shuttle Endeavour touched down at Kennedy Space Center in Florida early Wednesday morning, marking the end of the ship's career and the close of NASA's second-to-last shuttle mission.
Late Tuesday afternoon, NASA announced the selection of Boeing and SpaceX as the two spacecraft providers for the Commercial Crew Program. Flights are expected to begin by the middle of 2017.
Astronaut Mark Kelly, the husband of wounded U.S. Congresswoman Gabrielle Giffords, on Tuesday announced that he will retire from the National Aeronautics and Space Administration (NASA) on October 1 in order to focus on his fa...