By KENNETH CHANG
Joel W. Parker, a planetary scientist at the Southwest Research Institute, answers questions about putting a 220-pound lander on a comet.
Published: November 11, 2014 at 07:00PM
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By KENNETH CHANG
Joel W. Parker, a planetary scientist at the Southwest Research Institute, answers questions about putting a 220-pound lander on a comet.
Published: November 11, 2014 at 07:00PM
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