GUEST- Adam Frank is a physicist, astronomer and writer. He is a professor of astrophysics at the University of Rochester and has written the books Light of the Stars: Alien Worlds and the Fate of the Earth and About Time: Cosmology and Culture at the Twilight of the Big Bang. He is one of the minds behind The Silurian Hypothesis, which contemplates the existence of ancient civilizations from a scientific angle.

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