Is There Life on Mars? (NOVA): Four years after they landed on Mars, NASA s twin robot explorers, Spirit and Opportunity, have lasted 16 times longer and driven 20 times farther than expected. Today they are joined by an aerial armada of hi-tech satellites, surveying Mars from... (more details for Is There Life on Mars? (NOVA))

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File by Jung Choo (#1567)
2011-04-07 Grade: 6-8