12 Things Elon Musk Wants to Build

By Mark Milian - 2013-08-13T21:19:54Z

Photograph by NASA/JPL-Caltech/MSSS

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80,000-Person Colony on Mars

Perhaps all of Musk's inventions -- solar- and electric-powered vehicles, reusable rockets, PayPal (now with its own interplanetary commerce system) -- are parts of a grander scheme for the final frontier. Musk has said he wants to build a colony on the red planet that can support 80,000 people.

"I've said I want to die on Mars," Musk said at a conference in March. "Just not on impact."