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.

Officials from the Norwegian Space Center are looking for another launch opportunity for a microsatellite designed to track ship traffic and study space weather after engineers determined it could not safely be attached to a Soyuz rocket set for liftoff Friday.

With its payload shroud filled with multiple U.S. Air Force satellites heading for a high-altitude perch over the equator, a United Launch Alliance Atlas 5 rocket lifted off from Cape Canaveral Saturday at 7:13 p.m. EDT (2313 GMT) in its most powerful configuration with five strap-on solid-fueled boosters.