When billionaire entrepreneur Elon Musk founded his private spaceflight company SpaceX back in 2002, he had two goals in mind: to reduce the cost of space transportation, and to colonize Mars. Mars colonization may sound farfetched, but Musk is serious. He hopes to send humans to Mars' surface within 10 to 20 years. Later this year, he'll unveil a Mars Colonial transporter.
While Musk says he wants to go to Mars because he loves tech and it'd be an "awesome" feat, that's not the driving force behind his work...
You see, Musk believes it's the best way to prevent the extinction of humankind.
But from exactly what?