Notable Discoveries
See also: Planets beyond Neptune- The dwarf planet Pluto by Clyde Tombaugh in 1930.
- Large recessional velocities of galaxies by Vesto Melvin Slipher between 1912 and 1914 (that led ultimately to the realization our universe is expanding).
- Co-discovery of the rings of Uranus in 1977.
- The periodic variation in the activity of Comet Halley during the 1985/1986 apparition.
- The three largest known stars.
- The atmosphere of Pluto.
- Accurate orbits for two of Pluto's moons: Nix and Hydra.
- Oxygen on Jupiter's satellite Ganymede.
- Carbon dioxide ice on three Uranian satellites.
- The first Trojan of Neptune.
- Evidence that the atmosphere of HD 209458 b contains water vapor.
Read more about this topic: Lowell Observatory
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