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How can we even know it's a planet when we haven't observed a single orbit, yet?
Maybe it's just a really big comet.It's not really big. There are multiple Pluto like planetoids. Also there is a hunk of rock in the asteroid belt youcould name a planet.
By measuring how fast it's moving and where it is you can find the orbit
We've observed enough of its orbit to know what shape it is.
How can you be so sure it doesn't just decide to leave
And who could blame it?
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