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There's a fundamental difference, if you sort of look into the future, between a humanity that is a space-faring civilization, that's out there exploring the stars...compared with one where we are forever confined to Earth until some eventual extinction event.

"The mind behind Tesla, SpaceX, SolarCity". TED Talk, www.ted.com. February 2013.
There's a fundamental difference, if you sort of look into the future, between a humanity that is a space-faring civilization, that's out there exploring the stars...compared with one where we are forever confined to