Good news - or not so good news, depending on your point of view relative to these things - the world will not end on December 21, 2012, as (allegedly) predicted by the Mayan  calendar. So says NASA, at least, and I guess they would know about these asteroid things.

Eweek has an interesting article that gives details - Find it here.

On the NASA astrobiology site, there is a video where a scientist pours cold water all over all the fun. See it here.

So…go ahead and make those Disney World plans for December 2012. You should be good.