Moonquakes show the Moon is active, but shrinking

Monitoring devices placed on the moon by Apollo missions 11, 12, 14, 15, and 16 were able to record seismic activity between 1969 and 1977.

Combined with new location data, scientists at the Center for Earth and Planetary Studies at the Smithsonian's National Air and Space Museum have determined that the moon is experiencing quakes as it cools and shrinks, meaning it's a tectonically active world.

Watch the video for more.