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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > compact group > Stephan's Quartet

Stephan's Quartet comparison table

Subject	has number of galaxie	has definition	is a kind of	is an instance of
compact group	< 10	Galaxy group with a few galaxies separated by a few galaxy diameters.	galaxy group
Stephan's Quartet	4			compact group

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