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      Scientific American May 1928

      Another Astronomical Puzzle Solved

      The Problem of the Nature of the Peculiar "Planetary Nebulae" Gives Way to the Modern Astrophysicist

      • By Henry Norris Russell on May 1, 1928

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      More in the May 1928 issue of Scientific American
      • Camper's Knife, Eye-Comfort Cards and more
      • Making Fiber Board from Wood Chips, An Electric Bug House and more
      • One-piece Automobile Bodies
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