Searching for Past Life, Water on Mars

Researchers are using Mars rovers to explore the Red Planet, hunting for traces of water and searching for signs of past life. Recent sightings by the Spirit rover of concentrated areas of silica on the surface may hint at past water. Some scientists argue that Mars may have been home to gigantic seas.

Steven Squyres, principal investigator, NASA's Mars Exploration Rover Mission; professor of astronomy, Cornell University

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