How do we know that the force holding the earth in its orbit about the sun is

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How do we know that the force holding the earth in its orbit about the sun is not an electric force, since both gravitational and electric forces vary inversely with the square of the distance between centers of force?

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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