Bomb Radius (in Links)

http://www.carloslabs.com/projects/200712B/GroundZero.html

Here's a bit of perspective of nuclear warheads. The US is about to dismantle a 9 megaton B53 bomb. Fat Man, which destroyed Nagasaki, clocked in at just 21 kilotons. The biggest bomb was the USSR's 50 megaton Tsar Bomb, which is included in the list.

hmm.. better not have a asteroid hit us.