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To Get to Mars, Head for the Moon

Since the last mission to the moon, half a century ago, space enthusiasts have been talking about a trip to Mars. President Barack Obama this week reiterated the call for a U.S. mission to Mars that he first proposed in April 2010. He called for a partnership with private sector companies to develop the means to send humans to and from Mars by the 2030s. But a mission to Mars is fraught with challenges. A major problem is radiation. Earth is protected from cosmic rays by its...

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