Countdown starts for SpaceX's historic space mission

SpaceX on Saturday began a countdown to send two senior NASA astronauts to the International Space Station.  However, weather uncertainty may postpone the mission of the crew of this first historic commercial rocket for the seco…

SpaceX on Saturday began a countdown to send two senior NASA astronauts to the International Space Station.  However, weather uncertainty may postpone the mission of the crew of this first historic commercial rocket for the second time.

SpaceX's two-stage Falcon 9 rocket will be launched from the Kennedy Space Center in Florida at 3:22 pm (1922 GMT).  Astronauts Robert Behanken and Douglas Hurley will be launched into the Crew Dragon capsule.