"Lots of space rocks made headlines this year. A meteor <a href=""http://www.cnn.com/2013/02/15/world/europe/russia-meteor-shower/"" target=""_blank"">exploded in February</a> over Chelyabinsk, Russia, creating a blast equivalent to 300,000 tons of TNT. The very same day, <a href=""http://www.cnn.com/2013/02/07/us/asteroid-approach-earth/"" target=""_blank"">an asteroid passed by Earth</a>. And don't forget that <a href=""http://www.cnn.com/2013/10/18/tech/asteroid-near-pass/ "" target=""_blank"">one of the most dangerous asteroids on record</a> zipped close by Earth in September."
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