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December 29, 2019
April 9, 2019
June 19, 2017
July 13, 2016
May 24, 2013
September 28, 2011
September 5, 2011
→Chemical composition
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→Chemical composition
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→History of Comet Observation and Exploration
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August 3, 2011
October 28, 2008
July 24, 2008
→Oort cloud
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→See Also
→See Also
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→Problems for uniformitarian theories
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→Oort cloud
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Expansion
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February 23, 2008
May 9, 2007
April 24, 2007
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references/ tag
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Aristotle's description
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The word "comet" in fact derives from the Greek ''kome'' the hair of the head, and first appears in Aristotle's writing.
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Copying images used in the Halley's Comet article
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See also: Halley's Comet
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