Video: Falcon 9 with Crew Dragon briefly ignites engines (members only)

The launch of two NASA astronauts dealt with two previous scrubs due to a valve issue on the Atlas 5 rocket and then a ground system issue at the launchpad. Liftoff happened at 10:52 a.m. EDT (1452 UTC) on Wednesday, June 5.

SpaceX fueled up a Falcon 9 rocket, ran through a mock countdown and fired the booster’s nine Merlin main engines Friday in a successful preflight static fire test officials hope will clear the way for liftoff Jan. 6 on a space station resupply mission.

A United Launch Alliance Delta 4 rocket lifted off Wednesday at 2:36 p.m. EDT (1836 GMT) from Cape Canaveral on a mission to place into orbit a fresh satellite for the Global Positioning System.