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'Nine-Cruise-Ship-Sized' Asteroid To Be Radar Pinged On Fly-By | Video - Asteroid 1998 QE2 -- nearly 1.7 miles in diameter -- will makes its closest approach to Earth on May 31st, 2013, sailing within 3.6 million miles of Earth. Arecibo and Goldstone Radio Observatories will provide radar images of the drifting space rock.

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