Snapshot: Earth's close encounter with asteroid

This image made from radar data taken in April 2010 by the Arecibo Radar Telescope in Puerto Rico and provided by NASA/Cornell/Arecibo shows asteroid 2005 YU55. The asteroid, bigger than an aircraft carrier, will dart between the Earth and moon Tuesday, November 8, 2011 - the closest encounter by such a huge rock in 35 years. But scientists say not to worry. It won't hit. (AP Photo/NASA/Cornell/Arecibo)

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