pinomarco03 pinomarco03

06-04-2017
Physics

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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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dzrylie dzrylie

06-04-2017

Its Gravity. Gravity holds them together

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cclark354914 cclark354914

06-04-2017

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.

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