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Halley-type comets, together with long-period comets, however, appear to come from the Oort cloud. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/S/shortperiod.html )"],"synonym":[],"obsolete":false,"memberOf":[],"isInActiveScheme":["http://data.loterre.fr/ark:/67375/MDL"],"isInActiveCollection":[],"parents":[{"id":"http://data.loterre.fr/ark:/67375/MDL-VX2L2V9M-1","inScheme":["http://data.loterre.fr/ark:/67375/MDL"],"prefLabel":"comet","definition":["A comet is a small astronomical body, typically a few kilometers across, that orbits the Sun. Comets contain icy chunks and frozen gases with bits of embedded rock and dust, and possibly a rocky core, aptly described as a \"dirty snowball.\" Comets are leftovers from the formation of the Solar System and are believed to exist in vast numbers in the Oort Cloud and, to a lesser extent, in the Kuiper Belt. From these regions they can be perturbed by the gravitational influence of passing stars or interstellar clouds and thrown into new, highly elliptical orbits (see ellipse) that bring them into the inner Solar System. 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