Video: The launch of Orion

John Grunsfeld, Associate Administrator for the Science Mission Directorate at NASA Headquarters, speaks about the EFT-1 test flight and science opportunities made possible by the Orion capsule and its Space Launch System rocket.

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.

The rollout of the 322-foot-tall rocket took fewer than 12 hours after first motion, which occurred at about 12:20 a.m. EDT (0420 UTC). NASA hopes to launch the crewed test flight to the Moon no earlier than April 1.