Sunita Williams and fellow astronaut Barry Wilmore stepped out of the station on Thursday to perform maintenance work and wipe its exterior to check for any surviving Earth microbes.

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

President Donald Trump called the crash a "tragedy of terrible proportions." "Our hearts are shattered," Trump said in a press briefing at the White House, after holding a moment of silence. "Our ...