Live coverage: SpaceX supply ship returns to Earth

In this time-lapse video, a Falcon Heavy rocket is lifted into position atop launch pad 39A at the Kennedy Space Center in readiness for a pre-flight test firing of its 27 Merlin main engines.

Liftoff of the NROL-113 mission was at 8:20 p.m. PDT (11:20 p.m. EDT, 0320 UTC). The Falcon 9 was believed to be carrying the military version of SpaceX’s Starlink satellites.

Weeks after leaving its factory in New Orleans, the core stage for NASA’s first Space Launch System flight has been raised into a test stand at the Stennis Space Center to begin a series of checkouts culminating in an eight-minute engine-firing later this year.