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No one has been to Mars yet, and Elon Musk wants to change that in a big way. The SpaceX CEO says we need to put a million people on the Red Planet to make sure human civilization survives.

"I think there is a strong humanitarian argument for making life multi-planetary... in order to safeguard the existence of humanity in the event that something catastrophic were to happen," Musk said in a recent interview with the digital magazine Aeon.

Musk's comment sounds ominous but may not be off the mark, given the threats that scientists see in climate change and space rocks.

Good luck with that. And who's to say that we'd even be 'allowed' to? To read more, click here.