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http://fortune.com/2018/06/17/chris-hadfield-nasa-spacex-mars/?utm_source=twitter.com&utm_medium=social&utm_campaign=social-button-sharing

Hadfield noted “the technology that took us to the moon back when I was just a kid . . . can take us to Mars, He compared the prospect to trying to cross an ocean in a canoe. Hadfield tentatively suggested that ion propulsion, nuclear power, or even the manipulation of gravity might be safer.