01. What is a galaxy? (A K2S Question)

From The Space Library

Think about our solar system—nine planets orbiting our Sun. A galaxy is like that, only much bigger. Billions of stars, like our Sun, orbit something very massive, or heavy, in the center. That massive thing could be a very large group of stars, or even a giant black hole. That black hole could be as large as a million suns!

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Answer provided by Jim Zebrowski

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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