[KarlInOhio]

It's the big boys, thousands of miles in diameter that can snuff out human life on earth.

As of now, we have nothing to stop or deflect these monsters in space.

Aaaiiieeee! They sky is falling.

Let me count the number of asteroids with diameters in the thousands of miles. Hmmm, that would be zero.

Ceres is the largest asteroid, and its diamter is about 600 miles. A NASA site I found had only 7 with diameters above 100 miles, but I don't know if that list was complete.

[robertpaulsen]

Wow, it this asteroid hit Colorado it would have flattened 136,000 acres. No, wait, that already happened with a match.

[Cincinatus' Wife]

Those are the ones they know about.