Newly proposed definition of "a planet" still excludes Pluto

Almost eighteen years ago, the International Astronomical Union voted to change the definition of a planet. The new definition excluded Pluto, formerly considered the ninth planet in our solar system, shortly after its discovery in 1930. This decision angered many people, from astronomers who weren't among the 424 who voted on the change to people who had previously barely given Pluto a thought.  — Read the rest

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