An asteroid the size of a house is set to give Earth a close shave, and you can watch part of the space rock's approach live online this evening (Oct. 11 at 7PM CST).
Astronomers estimate 2012 TC4 to be 39 feet to 89 feet (12 to 27 meters) wide. That puts it in the same general size class as the object that exploded over the Russian city of Chelyabinsk in February 2013, injuring more than 1,000 people. So, were it to hit earth, only about a thousand might get injured. No big deal, right?