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Do intelligent aliens exist? Who knows? But here’s what we do know: the potential existence of intelligent aliens probes meaning and purpose in the universe. What would it mean if the universe were teeming with life? What would it mean if we humans were alone?

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Dimitar Sasselov has been a professor at Harvard since 1998. He arrived to CfA in 1990 as a Harvard-Smithsonian Center post-doctoral fellow. Between 1999 and 2003 he was the Head Tutor of the Astronomy Department.

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Closer To Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.