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Our idea of the Universe changed dramatically during the 20th century. Scientist such as Harlow Shapley and Henrietta Leavitt added to our understanding but it was Edwin Hubble who discovered that there were other galaxies composed of stars like ours. He measured the distances to these galaxies and discovered that they were moving away from us. In fact, the further way the galaxy the fast it was moving. He explained these facts by saying that the Universe was expanding If the Universe was ...