What exploded over Russia?
When the sun rose over Russia's Ural Mountains on Friday, Feb. 15th,
many residents of nearby Chelyabinsk already knew that a space rock was
coming. Later that day, an asteroid named 2012 DA14 would pass by Earth
only 17,200 miles above Indonesia. There was no danger of a collision,
NASA assured the public.
http://phys.org/news/2013-02-russia.html#nwlt
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