NASA officials announced Tuesday that they are seriously evaluating the possibility of sending the full-scale engineering model of the Perseverance rover, currently at the Jet Propulsion Laboratory in California, to the Moon. The rover, nicknamed "Promise," was originally built as a testbed for Perseverance and was not planned for launch. It would be equipped with a multi-mission radioisotope thermoelectric generator (MMRTG) to power it across challenging lunar terrain and through the long lunar night, a capability that solar-powered rovers lack.