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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > loose group > M 81 group
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M 81 group comparison table
Subject is part of has definition is a kind of is an instance of
loose group Galaxy group with on the order of 10 galaxies separated by 10-100 galaxy diameters.galaxy group 
M 81 groupLocal Supercluster  loose group

Next loose groupLocal Group    Uploose group