NOVA

Take a cross-country journey to explore the rise and fall of America's favorite planet.

Brian Williams, Jon Stewart, and Diane Sawyer wonder what will school science projects look like now that Pluto has been demoted.

What does the demotion of Pluto really mean to Americans? Brian Williams, Stephen Colbert, Diane Sawyer, and Jon Stewart speculate.

If Pluto is not a planet, what is it? Diane Sawyer, Jon Stewart, Stephen Colbert, and Brian Williams try to explain.

Stephen Colbert tries to come up with a new mnemonic to remember the planets in preparation for NOVA's The Pluto FIles.

Brian Williams and Jon Stewart ponder where we are without Pluto among the planets.

Stephen Colbert, Diane Sawyer, Brian Williams, and Jon Stewart wonder just who Neil deGrasse Tyson thinks he is?

Commenting on NOVA's The Elegant Universe on string theory and its relevance to modern physics.

Ten top physicists describe Einstein's famous equation E = mc² on NOVA's Einstein's Big Idea.

A conversation about the origins of the universe, life on Earth and in the cosmos, and a few of the astrophysical challenges confronting scientists today.