Rounded Pebbles on Mars (IMAGE)

University of Pennsylvania

Rounded Pebbles on Mars

Caption

The presence of rounded pebbles on Mars was evidence of a prior history of water on the planet. In a new study, researchers have used the pebbles' shape to extrapolate how far they must have traveled down an ancient riverbed. The analysis suggests they moved approximately 30 miles, indicating that Mars once had an extensive river system.

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NASA/JPL-Caltech/MSSS

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