The latest numbers from worldwide tracking stations and authorities on the ground indicate the Chelyabinsk meteor was the largest since the 1908 Tunguska event; exploded with a yield of about 500 ... more 
The latest numbers from worldwide tracking stations and authorities on the ground indicate the Chelyabinsk meteor was the largest since the 1908 Tunguska event; exploded with a yield of about 500 kilotons and didn’t cause nearly as much damage as it less 
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Sat, Feb 16, 2013 1:02 PM EST