destrekor
Lifer
- Nov 18, 2005
- 28,799
- 359
- 126
Originally posted by: Pheran
Originally posted by: destrekor
Asteroids, generally speaking, a major event hasn't happen in a long time.
This one is probably not accurate, as there is recent evidence that an asteroid strike may have taken out the large mammals (e.g. wooly mammoths) in North America 13,000 years ago, which is incredibly recent in geologic time. What the Nova Last Extinction episode (available online) for full details.
Well not really talking Extinction Level, just devastation.
An asteroid quite a few kilometers across won't kill us all, but it sure will leave a nasty scar.
Quite a few that are 50-100km pass relatively close to Earth quite frequently, sometimes as a surprise. Something relatively large hasn't hit in a long time, and those tend to be rather frequent in geologic time.
But then again, as Earth ages, the space around it becomes less messy, the planet has absorbed a lot of the debris around us already, so it makes sense that frequency will go down as the Earth ages. But a lot of junk is out there just floating around, and all it'll take is one to strike into the asteroid belt, knocking a couple about and sending a few off towards our neighborhood.