The Moon, the Tides and Neil DeGrasse TysonThe Moon, the Tides and why Neil DeGrasse Tyson is Colbert's God is the actual title of this interview.

Astrophysicist Neil deGrasse Tyson is the Director of the Hayden Planetarium in New York City, host of the PBS series NOVA Science Now and co-host (with comedienne Lynne Koplitz) of the radio show Star Talk.

He is the author of nine books including his memoir The Sky is Not the Limit: Adventures of an Urban Astrophysicist and his most recent, The Pluto Files: The Rise and Fall of America's Favorite Planet.

This is a conversation on cosmology, physics, and the history and purpose of science among other topics.

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