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Pluto: No Longer a PlanetEssay Preview: Pluto: No Longer a PlanetReport this essayOnce known as the ninth planet of the solar system, Pluto is now the second-largest dwarf planet. Composed primarily of ice and rock, Pluto took part of our Solar System for 76 years. It was discovered on January 23, 1930 by Clyde Tombaugh..