NASA's twin robot explorers, Spirit and Opportunity, have lasted for more than 4 years on Mars. And since May 25, 2008, they've had company: NASA's Phoenix probe, which dramatically "tasted" water ice on the planet in July. This NOVA showcases the latest scientific results from the rovers and Phoenix, which are poised to reveal provocative new clues in the tantalizing search for water and life on the Red Planet.
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