this post was submitted on 25 Jun 2023
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I was thinking about planet X, too! If it exists, maybe it's a captured exoplanet. That would be pretty cool.
Wait wait wait, wasn't it called Planet Nine?
I always heard it as Planet X. But someone else comments below it is now more common to refer to it as planet nine.
Though OPs article is suggesting there could be many such planets.
I also thought they were speculating that Planet X was huge. Though I can’t remember anymore it’s been too long since I followed this story.
I think disagreement about the planet status of Pluto may be what's behind the different names.