"Countdown to Doomsday"

Yesterday the Sci Fi Channel had a discussion in DC on their television program "Countdown to Doomsday," which airs tonight.

The first topic for discussion was the possibility that Earth could be hit by a really big asteroid.

"Why haven't we suffered more terrible destruction?" Douglass wanted to know [that's Linda Douglass, a former ABC congressional correspondent].

"Space is big," said Ed Lu, a NASA astronaut.