Quarter-mile-wide asteroid coming close to Earth$this->bbcode_second_pass_quote('', '[')img]http://cdn.physorg.com/newman/gfx/news/2011/quartermilew.jpg[/img]
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.
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The asteroid named 2005 YU55 is being watched by ground antennas as it approaches from the direction of the sun.
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If 2005 YU55 were to plow into the home planet, it would blast out a crater four miles across and 1,700 feet deep, according to Melosh's calculations. Think a magnitude-7 earthquake and 70-foot-high tsunami waves.
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Scientists have been tracking the slowly spinning, spherical, dark-colored object since its discovery in 2005, and are positive it won't do any damage.
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"We're extremely confident, 100 percent confident, that this is not a threat," said the manager of NASA's Near Earth Object Program, Don Yeomans.