SpaceX CEO Elon Musk wants to put humans on Mars in the next 10 to 15 years.

Renowned astrophysicist and StarTalk Radio host Neil deGrasse Tyson doesn't think a private enterprise, such as SpaceX, could ever lead a space frontier.

"It's not possible. Space is dangerous. It's expensive. There are unquantified risks," Neil deGrasse Tyson tells us. "Combine all of those under one umbrella; you cannot establish a free market capitalization of that enterprise."

Watch to find out more about Neil deGrasse Tyson's thoughts on private space initiatives.



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