Video: SpaceX launches first mission of 2020 (members only)

NASA and Northrop Grumman officials decided Friday to return a Pegasus rocket and its carrier aircraft from Hawaii to California, aborting a trip to Kwajalein Atoll in the Pacific Ocean for next week’s scheduled launch of a NASA research satellite to conduct additional testing.

The mission, dubbed USSF-124, was the eighth National Security Space Launch using a SpaceX Falcon 9 rocket. Liftoff occurred at the start of a four-hour launch window that opened at 5:30 p.m. EST (2230 UTC) on Wednesday.

A crew access arm was lifted into place at Space Launch Complex 40 at Cape Canaveral on Monday, as SpaceX races to ready the pad for its first Crew Dragon launch with astronauts as soon as January.