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  1. Johann Gottfried Galle - Wikipedia

  2. Johann Gottfried Galle | Discoverer of Neptune, Astronomer, …

  3. 175 Years Ago: Astronomers Discover Neptune, the Eighth Planet

  4. Galle, Johann Gottfried - Encyclopedia.com

  5. Discovery of Neptune - Wikipedia

  6. Johann Gottfried Galle Facts & Biography | Famous Astronomers

  7. Johann Gottfried Galle Biography - Life of German Astronomer

  8. Johann Gottfried Galle and the First Observation of Planet Neptune

  9. Neptune's discovery | Astronomy.com

  10. Johann Gottfried Galle - Encyclopedia.com