Tony has details on new developments surrounding a popular dinosaur extinction theory. His summary:

Scientist believe that certain evidence support the fact that two or more asteroids contribute to the decline, instead of just one. The impact crater of the believed “extinction asteroid”, in Chicxulub, Mexico, turns out to have been made 300,000 years before the dinosaurs disappeared.

[...] 300,000 years after the Chicxulub impact another asteroid hit and that asteroid is the one that may have finished off the dinosaurs. The second really interesting fact is that ELE asteroids hit the earth once every 100 million years, so mathematically, it is very unlikely that there would be 2 or more asteroids collide with the earth within a 300,000 year period. I’m really interested to see what other developments will come out of this theory.

I personally think a major asteroid collision, even an extinction-level one, won’t wipe humanity out instantly. Our species may not be the most biologically sturdy — hey, cockroaches will win in a nuclear war — but I think that we’ve got enough for our species to languish forward in the event of a catastrophe like that, say, for a few more generations. After that, all bets are off as to whether we’d be able to repopulate the planet the way we did, or if we’re a dead end.

All things considered, I hope by this time we are a spacefaring race. Who knows? Around the time a planetoid hits Terra, we could reseed it and set it aside as a natural park.