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NASA Scientist: “200 Billion Planets” In Our Galaxy

More from Ora: NASA Scientist: “200 Billion Planets” In Our Galaxy

Neil deGrasse Tyson: Skeptical Of Elon Musk’s Mars Plans

Larry King NowJun 15 '15

Neil deGrasse Tyson explains why the government should be funding Mars missions before businessmen, and why we need boundary-pushers like Elon Musk and Richard Branson.

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