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In 1930, the discovery of the planet Pluto was made by American astronomer Clyde Tombaugh at the Lowell Observatory in Arizona. This marked the first time a planet was identified beyond the known planets of our solar system. Tombaugh used a technique called "comparative astrophotography" to identify Pluto's position against the background stars. Pluto was initially classified as the ninth planet, but later redefined as a "dwarf planet" by the International Astronomical Union in 2006.

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