On February 15th (or, depending where you are, the 16th) a hunk of space rock 45 metres across, called 2012 DA14, will buzz Earth in the closest encounter ever recorded for an asteroid of that size. Zipping along at a speed, relative to Earth, of 7.8km a second (4.9 miles a second), it will approach within 27,700km http://econ.st/XsjCbn 
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