One of three necessary criteria for a celestial body to be considered a planet in the Solar System is "clearing the neighbourhood" of its own orbital zone. While Pluto is big enough to be round, it's too small to push other objects out of its orbital way. So, the International Astronomical Union “demoted” Pluto in 2006, leaving it out in the cold of the Kuiper Belt. Still feels like watching a kid getting kicked out of a TV talent show!Thoughts
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