Time lapse: Watch the Falcon Heavy placed on pad 39A

NASA astronaut Nick Hague and Roscosmos cosmonaut Alexandr Gorbunov arrived in Florida on Saturday afternoon ahead of their final launch preparations. A flight readiness review occurred on Monday, Sept. 23.

A forecast of low ceilings, thick clouds and rainy weather Thursday has led NASA and Northrop Grumman officials to push back the launch of an Antares rocket and a space station-bound supply ship from Virginia’s Eastern Shore to Friday morning.

Take a look back at the Dec. 22 liftoff of a SpaceX Falcon 9 rocket from Vandenberg Air Force Base in California, a launch that was visible across Southern California and as far away as Arizona as the booster climbed into sunlight at dusk to deliver 10 commercial communications satellites to orbit.