There’s also an anorthosite from Apollo 16, “an example of the really old Highland rocks on the moon,” says Strain, and a piece of breccia and soil samples from Apollo 17. “All together ...

Classified as a regolith breccia, it was found to be hiding ... have long conformed to the belief that the moon was bombarded by massive space rocks between 4.2 and 3.8 billion years ago.