5 Years On Mars: When the NASA rovers Spirit and Opportunity touched down on Mars in 2004, they weren t expected to last long perhaps 90 days, or six months at most. But 90 days have stretched into almost five years, and a short-term science mission searching for... (more details for 5 Years On Mars)

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File by Steve Chinnis (#2428)
2013-11-14 Grade: 9-10