so i guess they smashed a object into the moon to examine the dust cloud it generated today. Water as well as other materials are important for fuel purposes you have to remember 99% of the fuel they use is just to get out of the atmosphere if they could refuel on the moon they could do all kinds of crap in space. (water + electricity = hydrogen + oxygen = fuel) as well as of course water is main ingredient of known life forms. It will be interesting to see what they detect.
heres the video
http://www.msnbc.msn.com/id/33215937