It seems the Moon formed 4.35 billion years ago. But what if it's older, just took a long time to solidify? Tidal heating from Earth could have kept the magma ocean molten for hundreds of millions of years more. Then everything quickly hardened — and now we know why.
🎯 The two sides of the Moon are like two different worlds: the near side has smooth dark 'seas', while the far side is a chaos of mountains and craters. It turns out tidal heating is to blame: it made the magma solidify unevenly.