Research NewsAstronomy

Do Comets Get a Nudge From the Galaxy?

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Science  08 Nov 1996:
Vol. 274, Issue 5289, pp. 920
DOI: 10.1126/science.274.5289.920


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.