As with all hypotheses, it's not perfect. For example, if there's enough energy to liquefy the moon, there's enough energy to liquefy Earth's surface. But there is no evidence for large-scale magma seas in Earth's history. Also, the moon does have some volatile elements, like water, trapped in rock — but a giant-impact, giant-energy event should have gotten rid of those.

Almost 55 years after the launch of Apollo 11—the first mission to land humans on the moon—scientists have found evidence of a large cave system near the landing site of those astronauts.

Chinese scientists have made an unusual discovery while analyzing the sample Chang'e-5 collected from the Moon's surface in December 2020.

By retrieving rare volcanic samples from the lunar far side, Chang'e-6 aims to provide answers as to why volcanism was so limited on just one side of the moon.