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physical object > natural object > celestial body > nebula > reflection nebula > cometary nebula
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cometary nebula comparison table
Subject has volume has catalog has momentum has spectra has material has velocity has mass has extent has angular momentum has definition is part of has location has synonym has temperature is an instance of
Hubble nebula nebula catalog       A cometary nebula whose apex star is R Mon.gasor center of gravityNGC 2261 cometary nebula

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