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      Knowledge is Power

      Scientific American July 1993

      Edwin Hubble and the Expanding Universe

      More than any other individual, he shaped astronomers' present understanding of an expanding universe populated by a multitude of galaxies

      • By Donald E. Osterbrock, Joel A. Gwinn, Ronald S. Brashear on July 1, 1993

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      More in the July 1993 issue of Scientific American
      • QED for QCD
      • 50 and 100 Years Ago: Gases Dissolve in Metals and Discovery of a New Mammal
      • Accurate Measurement of Time
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