Water, Water Everywhere

NASA's Hubble telescope has found water vapor plumes emanating from Jupiter's moon Europa.  Scientists have found evidence of vast liquid oceans trapped beneath Europa's frozen surfaces, and suspect that these plumes are further proof that huge amounts of liquid water exists on Europa.  The Cassini spacecraft has also found evidence of liquid water spewing from geysers on Saturn's icy moon, Enceladus.  

Scientists, in their search for extraterrestrial life, entertain the tantalizing possibility that these two celestial objects harbor life, at least life as we understand it.  

Traces of liquid water have been found both on Mars and the Moon, as well.  Several nations are planning to establish human colonies on both Mars and the Moon, and the presence of water will certainly help make that endeavor a reality.