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| physical object > natural object > celestial body > nebula > H II region > compact H II region |
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| compact H II region comparison table | |||||||||||||||||||||
| Subject | has location | has material | has expansion velocity | has explosion date | is part of | has spectra | has volume | has catalog | has progenitor star | has temperature | has velocity | is an instance of | has momentum | has synonym | has extent | has mass | has image | has definition | has distance | has angular momentum | has composition |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hourglass Nebula | or center of gravity | typically 10 km/s | gas | planetary nebula catalog | planetary nebula | MyCn18 |  | A compact H II region in the center of Lagoon Nebula. | 8000 light-years away | ionized hydrogen |
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