18-August-2005, 07:01 AM
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Join Date: Mar 2004
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Evidence of an ancient crater lake found on Mars
From Highlights in Geophysical Research Letters:
Quote:
6. Evidence of an ancient crater lake found on Mars
A discovery of sediment fans in a Martian crater associated with two valley systems suggests that water once flowed over and formed lakes on the planet’s surface. Using imaging systems on the Mars Odyssey and Mars Global Surveyor spacecraft, Fassett and Head observed the fan deposits at the margin of a 40 kilometer [25 mile] crater in the Nili Fossae region. The sediment fans appear to have been deposited as deltas in the water-filled crater. The lake overtopped and breached the eastern crater rim, carving an outlet valley east of the crater and dropping the lake level.
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