What do we find in the galaxies?

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(B) Galaxies are massive systems consisting of stars,stellar remnants,interstellar gas,dust,and dark matter,all bound together by gravity. According t

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Clouds of gas and dust and stars

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(B) Galaxies are massive systems consisting of stars,stellar remnants,interstellar gas,dust,and dark matter,all bound together by gravity. According to the study of the origin of life and the universe,galaxies are primarily composed of vast clouds of gas (mostly hydrogen and helium) and dust,along with billions of stars. Therefore,option $B$ is the correct answer.

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