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| physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > nova remnant |
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| nova remnant comparison table | ||||||
| Subject | has expansion velocity | use to measure distance | is a kind of | has mass | has definition | has lifetime |
|---|---|---|---|---|---|---|
| expanding emission nebula | gaseous nebula | |||||
| nova remnant | typically 1000 km/s | expanding emission nebula | much lower than planetary nebula | an expanding emission nebula produced by a nova | a few centuries |
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