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...Pluto was only verifiably observed (discovered) in 1930. It has not even been a single century. Stop Mars isn't a planet? As far as we know, basically all tectonic activity there has stopped.

As far as I know, neither Pluto or Triton are thought to be captured exo-planets, just proto-Kuiper bent bodies. The current Nice model has explications for multiple historical occurrences for solar system formation and history. Pluto/Charon is the largest, but just one of several objects that...