Lurking deep below the moon's surface is something few expected to find: water. And there's more of it than we thought, according to a new study.
Which could be good news for future space exploration. Water is heavy and getting it into orbit takes a lot of power.
But if we could reach the water deposits on the moon, we'd need to haul less of it into space, making future lunar missions, or even colonies, that much more possible.
Previously, scientists had only found water near the polar regions of the moon, but this study found it all over the place.
So far, it looks like the water is located in old volcanic material, but there just might be ice hanging out in the moon's mantle, too.
And if that's the case, water has likely been on the moon since early in its formation.