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Question
(a) What is the approximate force of gravity on a 70-kg person due to the Andromeda galaxy, assuming its total mass is $10^{13}$ that of our Sun and acts like a single mass 2 Mly away? (b) What is the ratio of this force to the person's weight? Note that Andromeda is the closest large galaxy.
1. $3\times 10^{-10}\textrm{ N}$
2. $4\times 10^{-13}$
Solution Video