Huh, that is bizarre. How does this square with my understanding that the path is off by something close to a normal distribution? I guess that the big questi

Huh, that is bizarre. How does this square with my understanding that the path is off by something close to a normal distribution? I guess that the big question mark is time. If we know the path of the asteroid very precisely, and the path of the Earth very precisely, but we don't know exactly when the asteroid goes down that path, it would result in something like a risk corridor depending on where the asteroir was between leading and trailing the Earth at the point of impact. I wouldn't (in fact didn't) guess that. Thank you for the references!