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17,000 miles is close enough for me. That's closer than our GPS satellites. "The asteroid is similar in size to the object that exploded over Siberia, Russia, in 1908 in the Tunguska event. That explosion leveled hundreds of square miles of land, scientists said. While asteroid 2012 DA14 could potential[ly] create such destruction if it struck the Earth, there is absolutely no chance of an impact for the foreseeable future, NASA officials said. "This asteroid's orbit is so well known that we can say with confidence that even considering its orbital uncertainties, it can pass no closer than 17,100 miles from the Earth's surface," Yeomans said. "No Earth impact is possible." " http://www.space.com/19686-asteroid-2012-da14-earth-flyby-nasa.html Rick Whitman
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