Mark your calendars for November 8, 2011, because:
The near-Earth asteroid named 2005 YU55 — on the list of potentially dangerous asteroids — was observed with the Arecibo Telescope's planetary radar on April 19, 2010 when it was about 1.5 million miles from the Earth, which is about 6 times the distance to the moon.
Source: http://www.space.com/11310-huge-asteroid-2005-yu55-passing-earth-november.html
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