I'm an ex-NASA scientist - these are the planets where alien life really could exist

6 months ago 30

Astrophysicist Dr. Lisa Kaltenegger surveys the galaxy in her new book 'Alien Earths.' We 'might not even recognize' alien life, she says, when it's 'staring us in the face'

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I'm an ex-NASA scientist - these are the planets where alien life really could exist

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