Choose the best answer to each of the
Chapter , Problem 2QQ(choose chapter or problem)
Problem 2QQ
Choose the best answer to each of the following. Explain your reasoning with one or more complete sentence.
Why do disk stars bob up and down as they orbit the galaxy? (a) because the gravitational pull of other disk stars pulls them toward the disk (b) because of friction with the interstellar medium (c) because the halo stars keep knocking them back into the disk
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