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Percivall Howell found deviations in Neptune's and Uranus' orbit. He concluded that something big enough must be tugging on their orbits. He never found out what it could be.
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Clyde Tomboaugh at Lowell Observatory finally solved the mystery with the discovery of a large celestial body behind Neptune. It was then classified as a planet.
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Venetia Burney was given five pounds for her suggestion. Her suggestion was Pluto.
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Gerard Kuiper discovered a large outer area to our Solar System composed of trillions of icy fragments and bodies. Pluto falls into the Kuiper Belt.
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The twenty year period were Pluto is closer to the sun than Neptune begins.
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James W. Christy discovered the dwarf planet's first discovered and largest moon at the NOFS. It's name is Charon.
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Hubble Space Telescope photographed the first surface photos.
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The Hayden Sphere opens, grouping Pluto with the Kuiper Belt and not with the other planets. This was a big deal for everybody from New York Times writers to school children
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Mike Brown and his team discovered it. It is the biggest known dwarf planet. 27 percent bigger than Pluto. This was used as a major example to un-classifying Pluto as a planet.
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The Hubble Space Telescope was used by the Pluto Companion Search Team to find this moon. Its named after the Greek Goddess Nyx, the Goddess of night.
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Pluto's smallest moon was discovered by none other than Mark R. Showalter. It is called Hydra. It is named after the mythical creature Hydra, and several headed reptillian monster.
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The unmaned rocket New Horizons plans on flying by pluto and its five moons.
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A group of leading astronomers met in Prague. They decided that, because of new guidlines, Pluto was in fact not a Planet
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Discovered by M. R. Showalter. Named after the guard dog of the underworld, Cerberus. It is one of pluto's smallest moons.
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Mark R. Showalter, using the Hubble Space Telescope, discovered Pluto's fifth satalite.
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New Horizons is projected to flyby Pluto and its five moons at this time.
