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Technicians in the payload processing facility at NASA's Kennedy Space Center in Florida perform a fit check between NASA'S Mars 2020 Perseverance rover and its Multi-Mission Radioisotope Thermoelectric Generator on April 16-17, 2020. The Multi-Mission Radioisotope Thermoelectric Generator is designed and built by the U.S. Department of Energy, and provided to NASA as part of the space agency's Radioisotope Power Systems Program. It arrived at NASA KSC in April 2020 following its final assembly and transport from the Department of Energy's Idaho National Laboratory. The fit check is the first…