...it's always something.
Seems a bit ironic that we could all Kyoto ourselves into economic oblivion, then WHAMO, a Supernova, Sunburst, Asteroid, Comet, or something REALLY big can come by and whack us up the head anyways..
I guess its sorta like not riding on airplanes all your life, only to trip and fall down a flight of stairs to your death..
THIS was the topic of last nights weekly NOVA program on PBS.
They did a pretty good job of cramming in the last 30 years of Cosmology into a 1 hour, understandable program.