Researchers know that thin films of perhaps a few molecules cling to dust grains, but probably not in substantial quantities. More exciting are the results from the Lunar Crater Observation and Sensing Satellite (LCROSS), which NASA intentionally crashed into the Moon’s south pole in 2009. Amidst the dust it kicked up researchers detected signs of real grains of water ice. Colaprete, LCROSS’s principle investigator, likens the ice shards in the soil to bits of sugar mixed in with coffee grounds. This kind of water may actually be the most accessible to astronauts. Ice vaporizes directly upon contact with the vacuum of space, so collecting water could prove as simple as stirring up the dirt and catching the resulting vapor with a tarp.