In this artist's concept, astronauts search for ancient microbial life on Mars.

June 1, 1996

This artist's concept of possible exploration programs is called 20/20 Vision. Did life ever exist on Mars? If so, the best evidence may be fossils preserved in the rocks. Geologists and biologists will one day explore Mars, piecing together the history of the planet and perhaps its ancient life.

Credit

NASA by Pat Rawlings of SAIC

ENLARGE

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