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physical object > natural object > celestial body > collection of stars > galaxy > dwarf galaxy
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dwarf galaxy comparison table
Subject orbit has definition has acronym
blue compact dwarf galaxy  BCD
satellite galaxy A galaxy that orbits a larger one. The Milky Way has at least ten satellite galaxies. 
tidal dwarf galaxy A self-gravitating entity of dwarf-galaxy mass, built from tidal material expelled during interactions (e.g. AM0547-244, AM1054-325 and AM1353-272)TDG

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