A SpaceX Falcon 9 rocket carrying the international Sentinel-6B spacecraft lifts off from Space Launch Complex 4 East at Vandenberg Space Force Base in California at 9:21 p.m. PST Sunday, Nov. 16, 2025. A collaboration between NASA, ESA (European Space Agency), EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), and the National Oceanic and Atmospheric Administration (NOAA), Sentinel-6B is designed to measure sea levels down to roughly an inch for about 90% of the world’s oceans.