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Q. Our galaxy, the Milky Way, contains approximately 4 x 10^11 stars with an average mass of 2x 10^30 kg each. How far away is the Milky Way from our nearest neighbour, Andromeda Galaxy, if Andromeda contains roughly the similar number of stars and attracts the Milky Way with a gravitational force of 2.4 x 10^30 N?

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