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[[Comets]] are chunks of dust and ice.  Some are in an [[ellipse|elliptical]] orbit around the sun, meaning that they will return someday.  Some are in a [[hyperbola|hyperbolic]] orbit around the sun, meaning that they will only come into the solar system once and will never return.
 
[[Comets]] are chunks of dust and ice.  Some are in an [[ellipse|elliptical]] orbit around the sun, meaning that they will return someday.  Some are in a [[hyperbola|hyperbolic]] orbit around the sun, meaning that they will only come into the solar system once and will never return.
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== External links ==
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*[http://www.enchantedlearning.com/geography/glossary/ Glossary]
 
==References==
 
==References==
 
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