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Why is the Milky Way considered a galaxy?

A It contains all the planets of our solar system
B. It can hold up to 1 million planet Earths
C. It contains meteors, asteroids and comets, which do not need gravity
D. It contains a group of about 100 billion stars and other bodies held together by gravity

1 Answer

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D. It contains a group of about 100 billion stars and other bodies held together by gravity

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