What's the minimum safe distance from a supernova?

So apparently there are big burning things in the sky called stars. They are unstable, and I don't want to scare you, but they occasionally explode. When they explode, you don't want to be near them. But how far are you supposed to get away? It doesn't really matter, since if we're too close to any star there's… » 8/10/12 1:09pm 8/10/12 1:09pm

Massive Explosion Culprit Revealed: A Rogue Supernova

A decade after astronomers first spotted a huge, bright light source in the nearby Circinus galaxy, they've finally identified its source: a supernova, dubbed SN 1996cr. It took coordinating data from 18 different telescopes, via the Internet, to identify that nova, a milestone in the new era of "Internet astronomy."… » 9/26/08 4:30pm 9/26/08 4:30pm