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Last updated on April 20, 2014 at 14:04 EDT

Mars on Earth II

July 14, 2009

In many ways, Mars is the most Earth-like of the other planets in our solar system. Learn how scientists can interpret what they see on Mars by following geologist Jim Garvin, Mars lead scientist for NASA, on a virtual tour of Surtsey, a recently formed volcanic island in Iceland.
Credit: NASA