The space rock, which measures 150 feet across and is traveling at 38,922 miles per hour, is one of five on NASA's radar.
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Hubble Telescope discovers a new '3-body problem' puzzle among Kuiper Belt asteroids (video)It's a new type of three-body problem for astronomers, who used the Hubble Space Telescope to determine that twin asteroids in the Kuiper Belt could be triplets.
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