If interstellar travel and terra-forming planets is too difficult, what about moving planets into the habitable zone?
Tyson reveals man’s ability to move uninhabitable planets into ‘Goldilocks Zone’ is 100 percent possible
http://www.nydailynews.com/news/nati...icle-1.1380994
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"It's theoretically possible, yes, but whether that'll ever be practical or not," he advised, it would be better left for a science fiction novel.
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