Former Democratic Sen. Bill Nelson, a longtime space advocate whose district included the Kennedy Space Center and who flew aboard the shuttle Columbia in 1986 as a congressional observer, is President Biden’s choice to serve as NASA’s next administrator, the White House announced Friday.

As expected, NASA announced Wednesday that the first unpiloted test flight of a SpaceX Falcon 9 rocket and a Crew Dragon astronaut ferry ship has slipped from later this month to March 2. The first unpiloted flight of Boeing’s Starliner capsule is now targeted for the April timeframe.

NASA is modifying plans to send astronauts back to the moon in 2024 by taking the Gateway — a mini-space station to be assembled in lunar orbit — out of the critical path in favor of a simplified architecture, according to the agency’s chief of human spaceflight.