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      Knowledge is Power

      Scientific American November 1927

      "How do they Know"

      When Astronomers Talk of Galaxies of Stars 60,000,000,000,000,000,000 or More Miles Distant, How Have They Arrived at Such Stupendous Figures?

      • By Henry Norris Russell on November 1, 1927

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      More in the November 1927 issue of Scientific American
      • Applied Science for the Amateur, November 1927
      • From the Scrap-book of Science--Camera Shots of Scientific Events, November 1927
      • Life-boats Made Safer
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