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Johann Gottfried Galle - Wikipedia
Johann Gottfried Galle | Discoverer of Neptune, Astronomer, …
175 Years Ago: Astronomers Discover Neptune, the Eighth Planet
Galle, Johann Gottfried - Encyclopedia.com
Discovery of Neptune - Wikipedia
Johann Gottfried Galle Facts & Biography | Famous Astronomers
Johann Gottfried Galle Biography - Life of German Astronomer
Johann Gottfried Galle and the First Observation of Planet Neptune
Neptune's discovery | Astronomy.com
Johann Gottfried Galle - Encyclopedia.com