The unexpected find emerged from some 240,000 images taken by the long-orbiting Mars Global Surveyor spacecraft.
Images taken of the same areas over time showed investigators that liquid water likely flowed through gullies in Martian craters during the past seven years.
Telltale deposits of debris suggest that sediments were washed downhill by occasional liquid flows.
If not exactly "unexpected," this is an exciting confirmation. Moreover, it virtually cements the case for extant Martian life.
Now it's time to actually start looking for it instead of gawking at rocks.
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