The moon's interior may harbor 100 times more water than previous estimates, according to a new study that took a fresh look at samples of moon rocks collected by Apollo astronauts nearly 40 years ago.
The researchers determined that the lunar water likely originated early in the moon's formation history, suggesting that it is, in fact, native to the moon.
http://www.space.com/scienceastronom...nt-100614.html
With evidence recently that Mars once had oceans, it looks like there was a lot of water about in the early solar system.