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Nature 420, 618-619 (12 December 2002) | doi:10.1038/420618a
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Planetary science: Seeing double in the Kuiper belt
Daniel D. Durda
Abstract
A small fraction of Kuiper-belt objects are known to be accompanied by large moons. These double worlds may have formed in the earliest days of the Solar System through comparatively gentle gravitational encounters.
Beyond the orbit of the planet Neptune, in the deep freeze of the outermost region of the Solar System, there resides a vast population of icy worlds. The Kuiper belt is the source of many of the comets that periodically pass through the inner Solar System, and it offers planetary scientists a valuable laboratory for studying the accretion of planet-forming material and for understanding the evolution of the outer Solar System1.
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