there is water on the moon!
scientists long believed that a crater called Cabeus held what could be sources of water on the moon. since they couldn't find anyone crazy enough to fund an excavation up there, they took the next best route - blow it up.
that was where the rocket LCROSS came in - launched out of earth and collided with the moon, blowing part of it to bits in the name of science.
as it turned out, it did what it set out to do:
"Anthony Colaprete and colleagues analyzed data from the near-infrared and ultraviolet/visible spectrometers onboard the shepherding spacecraft, and they suggest that about 155 kilograms (342 pounds) of water vapor and water ice were blown out of the darkness of the crater and into the LCROSS field of view. They then estimate that approximately 5.6 percent of the total mass inside Cabeus crater (plus or minus 2.9 percent) could be attributed to water ice alone."
[source]
