Watch the Falcon 9 launch from pad 39A

SpaceX’s Dragon supply ship, loaded with nearly 5,500 pounds of cargo and experiments, aborted an approach to the International Space Station on Wednesday after encountering a problem in its GPS navigation system.

Launch of the Starlink 11-9 mission carrying 27 satellites for SpaceX’s internet service slipped a day from Sunday to Monday. Liftoff from pad 4 East at Vandenberg Space Force Base happened at 1:42 p.m. PDT (4:42 p.m. EDT, 2042 UTC).

SpaceX’s fired the engines of its Falcon Heavy rocket at launch pad 39A at 12:30 p.m. EST (1730 GMT) on Wednesday. The crucial pre-launch engine test has been repeatedly delayed since the rocket returned to the launch pad earlier this month.