PerspectivePlanetary Science

On the Edge of the Solar System

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Science  19 Nov 1999:
Vol. 286, Issue 5444, pp. 1487-1488
DOI: 10.1126/science.286.5444.1487

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Beyond the orbit of Neptune, the solar system has long been predicted to contain a large number of small objects, but until recently they were beyond the limits of detectability. A wealth of new observations is now elucidating the objects inhabiting the so-called Edgeworth-Kuiper belt, but central aspects of its evolution and structure remain controversial.