mass extinction

A discussion of Pluto, Apophis, and life on Mars on the Tonight Show with Jay Leno.

How can light show us the history of the universe?

NOVA scienceNOW producer Joe McMaster asks our series host, Neil deGrasse Tyson, why everyone should know about the Permian extinction.

Find out why we can't live with asteroids and we can't live without 'em.

What's in store for Earth?