Astrophysicist and television host Neil deGrasse Tyson.

Houston Matters

Cosmic Collisions: Neil deGrasse Tyson Says None Of Us Would Be Here Without Them

Posted on · Ahead of his Houston lecture on Jan. 15, Tyson tells Houston Matters producer Joshua Zinn that without cosmic objects like asteroids colliding with other bodies like the earth, the dinosaurs would still be at the top of the food chain. And he discusses the challenges science faces these days.