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Astronomy
Galaxies
Galactic Centers
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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Astronomers think that most galaxies are centered by a black hole, which exerts gravitational pull that binds the galaxy together.
Astronomers think that most galaxies are centered by a black hole, which exerts gravitational pull that binds the galaxy together.
Astronomers think that most galaxies are centered by a black hole, which exerts gravitational pull that binds the galaxy together.
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