This image provided Carl Agee, University of New Mexico, shows a rock from Mars that landed in the Sahara Desert. An examination of the Martian meteorite known as NWA 7034 determined it is 2.1 billion years old and is water-rich. (AP Photo/University of New Mexico, Carl Agee)

Associated Press
This image provided Carl Agee, University of New Mexico, shows a rock from Mars that landed in the Sahara Desert. An examination of the Martian meteorite known as NWA 7034 determined it is 2.1 billion years old and is water-rich. (AP Photo/University of New Mexico, Carl Agee)
This image provided Carl Agee, University of New Mexico, shows a rock from Mars that landed in the Sahara Desert. An examination of the Martian meteorite known as NWA 7034 determined it is 2.1 billion years old and is water-rich. (AP Photo/University of New Mexico, Carl Agee)
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