OT: What is the biggest

[Slick]

What about getting hit by a large asteroid? This could end all life. There is only a tiny amount of funding and effort being expended on looking for these things. And little or no effort going into planning what we would do if we found one on a collision course. We may not even be able to stop something like this, but the sooner we discover an asteroid on a collision course, the more time we have to react. The idea is we find out 30 or 50 years beforehand and then maybe we could deflect it. A those ranges, even a tiny change in its course would make it miss earth.

Slick.