Gullies on Vesta Suggest Past Water-Mobilized Flows

Protoplanet Vesta, visited by NASA's Dawn spacecraft from 2011 to 2013, was once thought to be completely dry, incapable of retaining water because of the low temperatures and pressures at its surface.

from News and Features - NASA's Jet Propulsion Laboratory http://ift.tt/1ClCAJk

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