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There Could Be Captured Planets in the Oort Cloud
(www.universetoday.com)
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this post was submitted on 25 Jun 2023
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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.