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A newfound asteroid has been discovered to be trailing Earth on an oddball course: an orbit that looks a lot like a horseshoe. The space rock, called asteroid 2010 SO16, has been following Earth as our planet orbits the sun for at least 250,000 years and is up to 1,312 feet (400 meters) wide. Its average distance from the sun is identical to that of the Earth, and its orbit is like that of the Earth. [Source: CBS News]
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