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Science 5 September 2003:
Vol. 301. no. 5638, p. 1304
DOI: 10.1126/science.301.5638.1304
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News of the Week

PLANETARY SCIENCE:
Comet 'Factory' Found to Have Too Little Inventory

Govert Schilling

The Kuiper belt is thought to be the source of the stream of comets that swing into the inner solar system, and yet a meticulous search has turned up fewer than 4% of the expected number of small objects there, leaving researchers wondering where the precursors of comets might be hiding.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)