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comet planet

(planet with some characteristics of a comet)

The term comet planet has been used for bodies with some characteristics of a comet and others of a planet. Examples are extra-solar planets that show a tail, and/or that have eccentric comet-like orbits, yet appear to be rocky or possibly to have a rocky core as would a planet. An example is Gliese 436 b which appears to show a tail.


(planet type)
http://en.wikipedia.org/wiki/Gliese_436_b

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