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Reference Terms
from Wikipedia, the free encyclopedia

Comet

A comet is a small body in the solar system that orbits the Sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail - both primarily from the effects of solar radiation upon the comet's nucleus, which itself is a minor body composed of rock, dust, and ices.

Note:   The above text is excerpted from the Wikipedia article "Comet", which has been released under the GNU Free Documentation License.
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