Mars journey: Unsolved technical problems

A U.S. scientist says human missions to Mars face technical challenges well beyond those faced during the exploration of the moon.

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<p><a href="http://www.physorg.com/news79015566.html">Mars journey: Unsolved technical problems</a></p> <p>A U.S. scientist says human missions to Mars face technical challenges well beyond those faced during the exploration of the moon.</p>