Over the weekend, I posted about asteroid 2012 DA14, which is not the threat some people are claiming it is (at least not right away). And now I have to tell you about an asteroid that might be a threat in the year 2040. Most likely it won’t be, but it’s something we need to look at carefully.

From Phil Plait, the Bad Astronomer: Asteroid 2011 AG5: a football-stadium-sized rock to watch carefully