"There's even more water on the moon than we previously thought, according to new analysis of tiny glass beads left over from ancient volcanic eruptions.
The naturally occurring beads were collected in the 1970s as part of the Apollo 15 and 17 missions, which landed near zones of volcanic activity. The beads formed when magma bursting onto the surface crystallized in such a way that water became trapped inside.
However, scientists couldn’t be sure if the Apollo samples are unique or if other volcanic flows on the moon are filled with water-bearing glass.
In a new study published today in Nature Geoscience, scientists reexamined the Apollo samples and used more recent satellite data to look for signs of water-bearing beads elsewhere on the moon. They found that the volcanic deposits are indeed widespread, which suggests that the material inside the moon is wetter than previously thought..."