NOVA: "ASTEROID: DOOMSDAY OR PAYDAY"
PBS, 9:00 p.m. ET
On one side of the argument, all those doomsday movies about asteroids heading straight for Earth, doing to us what they have done to the dinosaurs. (The asteroid that exploded over Siberia could be Exhibit A in this regard.) On the other side, galactic miners who see in nearby asteroids a fortune in raw materials – iron, nickel, platinum and other precious finds. Check local listings.