News of the WeekAstronomy

Comet's Course Hints at Mystery Planet

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Science  06 Apr 2001:
Vol. 292, Issue 5514, pp. 33
DOI: 10.1126/science.292.5514.33

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Summary

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.