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Science 8 November 1996:
Vol. 274. no. 5289, pp. 920 - 0
DOI: 10.1126/science.274.5289.920
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Research News

Charles Seife

What dislodges comets from their roost in the Oort Cloud, a vast spherical halo of icy objects that extends from the orbit of Pluto outward for more than a light-year? A new analysis points to the gravitational influence of the distant galaxy.

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