Before any NASA mission is launched, the spacecraft goes through weeks of harsh treatment. It's strapped to a big table that shakes as hard as the pounding of a rocket launch. It's bombarded with louder noise than a stadium rock concert. It's frozen, baked, and irradiated in a vacuum chamber that simulates the extremes of space. The Surface Water and Ocean Topography mission (SWOT), a collaborative U.S.-French mission to monitor all the water on Earth's surface, has passed these major tests. Now, except for a few final checks, SWOT is ready for its December launch.

Some of SWOT's engineers at NASA's Jet Propulsion Laboratory in Southern California have invested almost a decade in designing, building, and assembling this complex mission. Watching the instruments they've labored over go through the latest round of tests has been stressful, but the team has taken the process in stride.

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Billy Keim, a NASA technician, removes a 16-megapixel detector from its shipping container internal fixture as engineer Stephanie Cheung coordinates the activity. NASA's future Nancy Grace Roman Space Telescope will be fitted with 18 of these infrared detectors, which have now been flight-approved.

The Roman team possesses extra detectors that will be used for other purposes. The team reserved six of the surplus detectors to serve as flight-quality backups and several more for testing. Additional spare detectors may serve as the eyes of other telescopes with more lenient quality requirements.

Roman has delivered four detectors to be used in the 64-megapixel camera in Japan's Prime-focus Infrared Microlensing Experiment (PRIME) telescope, located in the South African Astronomical Observatory in Sutherland. The detectors are contributed as part of an international agreement between NASA and the Japan Aerospace Exploration Agency (JAXA).

This telescope, which will be commissioned this fall, will hunt for exoplanets—worlds beyond our solar system—using the microlensing method. Roman scientists will use the results of this precursor survey to inform their observing strategy, maximizing the number of planets the mission will find.