Science: Two groups of comets are known:
those with orbital periods of hundreds of years or greater, and
those with decade-long periods. A third class appears to be
orbiting within the asteroid belt.
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© 2006 American Institute of Physics
Ice Among the Rocks
1 May 2006
DOI:https://doi.org/10.1063/PT.5.020061
Content License:FreeView
EISSN:1945-0699
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