Tyson

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On the hunt for dark matter

Dark matter, one of cosmology's most curious mysteries, has yet to be seen. But theorists have good reason to believe that it exists, and that galaxies, stars, and planets could never have formed without the gravitational attraction that dark matter exerts.

Cosmic Quandaries

Astrophysicist Neil deGrasse Tyson talks about the mystery of "dark matter" and a new planet, discovered in a distant galaxy, that looks remarkably like planet Earth.

Lunar Love

Astrophysicist Neil deGrasse Tyson talks about why it's time for Americans to return to the moon.

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