Our cover picture ...
... shows the radar image of the asteroid 2005 YU55 obtained with the Goldstone radar in California during its close flyby of Earth in early November 2011. The asteroid passed Earth on 8 November 2011 at a distance of 324,900 km and passed the Moon on 9 November at a distance of 239,500 km. 2005 YU55 measures 310 to 400 meters. © NASA/JPL-Caltech
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