A closer look

The majestic glowing orb in our night sky is basically turning into a giant, rocky space raisin. As the Moon's once-molten interior has gradually cooled over hundreds of millions of years, its overall surface volume has contracted. Because the lunar crust is brittle, this shrinkage causes the surface to literally snap and buckle, generating intense 'moonquakes' and forming massive thrust faults. Give it a few billion years, and it'll be a sad, shriveled pebble.