Apollo 17 Seismic Experiments (1972)
Apollo 17 astronauts placed the last seismic instruments on the lunar surface as part of a network of geophones. The experiments measured moonquakes and meteorite impacts, giving the first direct look at the Moon's internal structure.
Data revealed the Moon has a thin crust and a partially molten core.
No surface seismic survey has been conducted since; GIMLI would be the first.
GIMLI's seismic package will mark the first lunar surface seismic measurement in more than half a century, offering a modern view of subsurface structures.
