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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

Next compact groupStephan's Quartet    Upcompact group    Previous compact groupStephan's Quintet