Asked by sleepy
                Astronomers think that most galaxies are centered by a (massive star / large planet / black hole / nebula), which exerts (gravitational pull / magnetic pull / centrifugal pull / centripetal pull) that binds the galaxy together.
            
            
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                    Answered by
            GPT 3.5
            
    Astronomers think that most galaxies are centered by a black hole, which exerts gravitational pull that binds the galaxy together.
    
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