A 40m-long chunk of rock hurtling through space will pass closer to the Earth than any other near miss on record, Nasa is expected to say.
Scientists at the space agency are expected to reveal the reassuring news for Earthlings at a news conference on Thursday.
Their calculations predict Asteroid 2012 DA14 will whistle past Earth on February 15 closer than the orbit of some weather and communications satellites, speeding by at a distance of 17,000 miles (27,400km).
http://news.sky.com/story/1048633/asteroid-to-skim-by-in-record-near-miss-nasa 
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