Elon Musk predicts it would take 40 to 100 years to build a self-sustaining civilization on Mars https://t.co/kjjRuaQUlq http://pic.twitter.com/ZloLBMkgJ7
— The Verge (@verge) September 28, 2016
from Twitter https://twitter.com/verge
September 27, 2016 at 06:52PM
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