The Surface Water and Ocean Topography, or SWOT, satellite during solar array deployment testing at Thales Alenia Space’s factory in Cannes, France. Credit: Thales Alenia Space
A French-built satellite equipped with an innovative U.S.-made radar instrument is buttoned up for blastoff aboard a SpaceX Falcon 9 rocket Friday from California, kicking off a mission to investigate the link between Earth’s water cycle and our planet’s changing climate.

