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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > compact group > Seyfert's Sextet
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Seyfert's Sextet comparison table
Subject has number of galaxie is part of is a kind of is an instance of has definition has brightest member
compact group< 10 galaxy group Galaxy group with a few galaxies separated by a few galaxy diameters. 
Seyfert's Sextet6Serpens compact groupA compact group of galaxies surrounding NGC 6027. It has both spiral and irregular members.NGC 6027

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