Sentinel-6B Spacecraft Mated to Work Stand

Technicians transfer the Sentinel-6B spacecraft from the NASA hangar to the Astrotech Space Operations payload processing facility at Vandenberg Space Force Base in California on Thursday, Sept. 25, 2025. Sentinel-6B will undergo detailed inspections, tests, and fueling in a cleanroom as it prepares for a November launch on a SpaceX Falcon 9 rocket. The spacecraft is designed to measure sea levels down to roughly an inch for about 90% of the world’s oceans. Sentinel-6B also will extend the record of atmospheric temperatures, begun by Sentinel-6 Michael Freilich, out to a decade.