4K Video: The launch of Crew 4 as seen from the press site

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 rocket booster SpaceX used to launch a planet-hunting NASA observatory two months ago fired again Saturday at Cape Canaveral, clearing a major pre-flight checkout before blastoff June 29 with a space station supply ship.

SpaceX is set to resume launches from pad 40 at Cape Canaveral in December with the liftoff of a space station-bound supply ship on top of a Falcon 9 booster, a major step in boosting the company’s flight rate and readying for the debut of the long-delayed Falcon Heavy rocket.