Earth to Mars in 30 days: Trip could be shortened dramatically by fusion rocket.

From Earth to Mars in 30 Days (VIDEO)

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April 11 2013 3:03 PM

From Earth to Mars in 30 Days (VIDEO)

That's less time than it took Columbus to cross the Atlantic.

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Aug. 28 2015 12:31 PM What Happened at Slate This Week? International affairs writer Joshua Keating on what to read to understand the apparently permanent slowdown of the Chinese economy.