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The universe contains billions of galaxies. The largest galaxies contain a trillion stars. What holds each galaxy together?
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The universe contains billions of galaxies. The largest galaxies contain a trillion stars. What holds each galaxy together?

User Shaba
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Although scientists are not certain, it's theorized that the center of each galaxy contains a supermassive black hole. This black hole has the gravity to pull together billions of stars in an orbit.
User GutenYe
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Its Gravity. Gravity holds them together
User Beyamor
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