6/10/2013

The veteran Mars rover Opportunity has found soil samples spanning a significant amount of the planet's geologic history, NASA scientists said. The Opportunity team reported that the analysis of one rock contained a type of clay formed by water more than 4 billion years ago. The veteran rover, which was joined on the planet by the Curiosity rover last year, has explored Mars' transition from a benign environment that included water, to its current dry, harsh climate.

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