>>16636909
>I thought the Planet X / Nine theories were made up by random schizos in the early years of YouTube
Lol not even close. There are basically three and a half flavors of the "planet X" theory.

First was the original dating back to the 19th century, where the existence of an unknown massive TNO was inferred from observation. Pluto got discovered and then was discarded as Planet X once it became known how small it was.

The second came after Pluto's mass was calculated more accurately in '78 and some scientists said that the numbers still didn't work out and went back to inferring the existence of an unknown massive TNO. This died in the early 90s after Neptune's estimated mass was adjusted following the Voyager 2 flyby and none of the probes had registered any deviation that could be attributed to a massive TNO.

Third, you have the more recent theory with some scientists claiming that there's something massive and dark way the fuck out there based on the orbits of VERY distant TNOs; IIRC the current estimate is that Planet X would have a perihelion of like 400AU. This one is still being debated.

Finally you have the SF authors who find unknown planets handy plot devices and the /x/-tier schizos who have a whole bunch of claims - that planet X periodically swings in close and causes cataclysms, that it's the homeworld of the Annunaki, etc. The usual stuff.

Various other claims (brown dwarf at 1.5 AU, a planet in the oort cloud, etc.) have all been pretty thoroughly deboonked.

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Woah wait, hold on... THIS is why Pluto isn't a planet? This is what the criteria for planet is?? I always assumed the people who cry about Pluto…