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The smallest, darkest, and coldest planet discovered in 1930 is Pluto. Initially classified as the ninth planet in our solar system, Pluto is known for its icy surface and distant orbit, which contributes to its extremely low temperatures. Its discovery by Clyde Tombaugh marked a significant milestone in astronomy, although it was later reclassified as a "dwarf planet" by the International Astronomical Union in 2006.

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2d ago

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