Year of the Solar System, April 2011: Water, Water, Everywhere!

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Source:  NASA Scientists   

Excerpt: Planetary scientists once thought Earth was an oasis in a dry solar system, as early missions to our neighbors revealed desert-like conditions on the Moon, Mars, and Mercury. ...Missions in recent years have overturned our view of a dry solar system, returning mounting evidence of ample water from a vast array of locations. …Jupiter's moon Europa  …Comets ... Mars  ...The Moon, ... Even Mercury....

 solarsystem.nasa.gov/yss/display.cfm

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