Video: Delta 4-Heavy tower rollback

The four RS-25 engines at the bottom of NASA’s first Space Launch System core stage shut down about a minute into a ground test-firing Saturday that was supposed to last more than eight minutes.

In a major shakeup at NASA Headquarters, agency Administrator Jim Bridenstine said Wednesday that Bill Gerstenmaier, the widely respected director of human spaceflight, has been replaced in the midst of an ambitious push to meet the Trump administration’s directive to send astronauts back to the moon within five years.

NASA Administrator Charlie Bolden speaks to Spaceflight Now’s Stephen Clark about the upcoming test flight of the Orion space capsule on the EFT-1 mission.