Live coverage: SpaceX Falcon 9 launches

Two veteran NASA astronauts rocketed away from the Kennedy Space Center in Florida on Saturday to begin a test flight of a new commercial spaceship designed, built and owned by SpaceX.

A SpaceX Dragon supply ship arrived at the International Space Station Saturday carrying a new docking mechanism, a spacesuit for future spacewalks, and a 3D bioprinter to test the feasibility of manufacturing human tissue in microgravity.

With the SpaceX scrub earlier this week and the time needed to convert the Eastern Range over to the Delta 4, liftoff of that rocket carrying an internationally-purchased military communications satellite for the Air Force has been bumped to Saturday evening.