Possible clay-bearing rocks
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Rover may have found clays on Mars

Nasa's Opportunity Mars rover has been trundling over what scientists believe to be clay-bearing rocks on the edge of a wide bowl known as Endeavour Crater.

The rover's principal investigator, Prof Steve Squyres, from Cornell University in Ithaca, New York, told our correspondent Jonathan Amos what the robot has seen.

  • 07 Dec 2012