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Coprnicus had the theory that the Earth was not the center of the solar system but the sun was and all the other planets including Earth orbited the Sun. His ideas were published in a book shortly after he died.
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After 1610 Galileo started openly supporting the heliocentric theory of Copernicus, and started reasearching the planets into more depth.
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Uranus discovered and named by Sir William Herschel, Herschel was the first astromener to correctly describe the spiral structure of our milkyway galaxy.
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Neptune was discovered by John Couch Adams in 1846, when he predicted the position of it, but did not publish his work. Half of the credit also goes to Urbain Jean Joseph Le Verrier for doing indepentent work with two other astronomers.
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Pluto was discovered by Clyde Tombaugh in 1930, when he looked for the source of the odd anomaly with Neptunes and Uranus orbit and found Pluto, with a later discovered flawed theory.
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All the other planets are visable by naked eye and a discoverer of them can not be credited. Everyone found them(technicly)
