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Science 19 November 1999:
Vol. 286. no. 5444, pp. 1487 - 1488
DOI: 10.1126/science.286.5444.1487
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Perspectives

PLANETARY SCIENCE:
On the Edge of the Solar System

Rodney Gomes

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.

The author is in the Departamento de Astronomia, Observatorio Nacional, Rua General Jose Cristino, 77, 20921-400 Rio de Janeiro, Brazil. E-mail: rodney{at}on.br

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