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

The media briefing came after the agency formally pushed back the launch of the SpaceX Crew-9 mission to the International Space Station from mid-August to late-September.

SpaceX’s Falcon 9 rocket completed a prelaunch hotfire test at launch pad 39A at NASA’s Kennedy Space Center in Florida on Tuesday in a signifiant step before Sunday’s scheduled liftoff of a top secret U.S. government spy payload.

Watch as the launch of a Falcon 9 rocket on a space station resupply run is aborted 13 seconds before liftoff when ground controllers were alerted to a potential problem with the vehicle’s second stage steering system.