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A collage of six planetary radar observations of the asteroid 2011 AG5 captured a day after the space rock made its close approach to Earth on Feb. 3. (Image credit: NASA/JPL-Caltech)
A collage of six planetary radar observations of the asteroid 2011 AG5 captured a day after the space rock made its close approach to Earth on Feb. 3. (Image credit: NASA/JPL-Caltech)