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| physical object > natural object > celestial body > nebula > reflection nebula > cometary nebula | 
| 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. | gas | or center of gravity | NGC 2261 | cometary nebula | 
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