A new analysis of Apollo-era quakes on the moon reveal that our satellite is probably still tectonically active. Detectors laid down by Apollo astronauts half a century ago revealed small shakes on the moon, but their causes weren’t well understood. Meteor strikes, like those that caused the moon’s most distinctive features, still rain down today, so astronomers couldn’t be sure whether the moon was shaking itself, or being shaken by external forces.

Now, new research has tracked the epic