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Science 6 April 2001:
Vol. 292. no. 5514, p. 33
DOI: 10.1126/science.292.5514.33
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News of the Week

ASTRONOMY:
Comet's Course Hints at Mystery Planet

Govert Schilling

A supercomet following an unexpectedly far-flung path around the sun suggests that an unidentified planet once lurked in the outermost reaches of the solar system, an international team of astronomers reports. What's more, the scientists say, the mysterious object may still be there.

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