The fully-integrated LEMS (Lunar Environment Monitoring Station) ready for environmental testing. NASA GoddardNASA has declared “wrenches down” on the first completed payload designed for Artemis astronauts to deploy on the Moon's surface. “The completion of the LEMS scientific instrument is a major step in a new era of lunar surface science. NASA JohnsonThe LEMS payload builds on a legacy of lunar seismic tracking. Past lunar surface instruments relied on radioisotope heaters for warmth and power.