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| physical object > natural object > celestial body > collection of stars > galaxy > active galaxy > blazar > Optically Violent Variable galaxy |
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| Optically Violent Variable galaxy comparison table | |||
| Subject | is a kind of | has acronym | has definition |
|---|---|---|---|
| blazar | radio galaxy | A term collectively used to refer to Optically Violent Variables (OVVs) and BL Lac objects. | |
| Optically Violent Variable galaxy | blazar | OVV |
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