Perhaps more than any other person, Edwin Hubble (1884-1953) expanded our view of the universe. At the dawn of the 20th century, most astronomers thought that the Milky Way Galaxy was the universe, and it measured only a few thousand light-years across. In the 1910s, Harlow Shapley showed that the galaxy actually stretches about 100,000 light-years, and Henrietta Leavitt determined that the Large and Small Magellanic Clouds (two companion galaxies to our own, visible from the …
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showed last 75 words of 255 total
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