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...2 rev 1900s 20th century Technology North America United States 1905 1905 Percival Lowell predicts the existence of an unknown planet, almost exactly where Pluto is discovered 25 years later Lowell, Percival (1855–1916) A Dictionary of Astronomy 2 rev 1900s 20th century Technology North America United States 1915 1915 The nearest star to earth, the red dwarf Proxima Centauri 4.22 light years away, is discovered by Robert Innes, Scottish director of the Johannesburg Observatory Proxima Centauri A Dictionary of Astronomy 2 rev 1910s 20th century Science...