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Prof. Jack Mustard and his graduate student, Kevin Cannon, at Brown University reported in Geology magazine that they had found impact glass in several craters on Mars. This discovery is particularly relevant to the Martian crater named after the late Princeton geoscience professor, Robert B. Hargraves *59. Mustard and his colleagues are proposing to land the Mars Rover 2020 on the impact ejecta from Hargraves Crater.