Stop Worrying About Asteroids

alnapp writes: "It appears that international efforts to track asteroids are missing the main worry, according to Bill Napier of the Armagh Observatory speaking to New Scientist. Comets, it would seem are more likely to cause us grief. I know that as kids we were told that space dust was bad for you (is that a too "UK" centric reference) but this seems like just another panic waiting to happen."