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Water on Mars Slideshow
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Ancient Cliffs
NASA/JPL

Ancient Cliffs
This mosaic brings together several images taken by the Mars Global Surveyor. The new light-toned gully, by itself, does not prove that liquid water exists on Mars. But taken together, this observation and that of a similar light-toned flow in the Terra Sirenum region provide tantalizing evidence there might be sources of liquid water beneath the surface of Mars.


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NASA/JPL

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