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Line 1: − [[Comet]]s are observed to come into the [[Solar System]] from all directions{{fact}}, and on each orbit as they pass near the sun they lose material, which forms the comet's "tail".+ − This loss of material means that they must have relatively short lives (calculated to be 11 million years at the most<ref>Faulkner, 1997</ref>), which means that they could not have been travelling past the sun for the supposed 4,600-million-year age of the Solar System.+ − + − Most cosmologists therefore believe that there must be a source supplying fresh comets, and this is believed to be a giant sphere surrounding the solar system. This sphere is called the '''Oort cloud''' after Jan Oort who postulated its existence in 1945. Thus most comets are said to come from the Oort cloud, with the rest coming to the solar system from the nearer [[Kuiper Belt]], which is located past the orbit of [[Pluto]]. Kuiper belt objects are suspected by those who believe the universe to be billions of years old to be the source of the [[Jupiter]] family, a group of comets whose orbits take them between Jupiter and the sun in a short period of time (3-5 years). Comet Shoemaker-Levy 9 may have been one of those.+ − + − [[Young Earth Creationist|Young-Earth creation]] scientists point out that there is no hard evidence for the existence of the Oort comet cloud, and that it is nothing more than an ''ad hoc'' explanation for the existence of "young" comets in an "old" Solar System, and that the actual evidence is more consistent with a biblical age of the universe.<ref>Faulkner, 1997 and Faulkner, 2001</ref> − − == Sources == − − * Faulkner, Danny, [http://www.creationontheweb.com/content/view/1528 Comets and the age of the solar system], ''Journal of Creation'' 11(3):264–273, December 1997. − * Faulkner, Danny, [http://www.creationontheweb.com/content/view/1830 More problems for the ‘Oort comet cloud’], ''Journal of Creation'', 15(2):11, August 2001. − − == References == − <references /> − − {{Solarsystem}} − [[Category:Astronomy]]
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