The early Solar System was a turbulent and chaotic place with icy material hurled far from the Sun, becoming the Oort Cloud. Larger objects and planets were probably hurled into the Oort Cloud too, and some might have been kicked out of the Solar System entirely. If a similar situation happened in other star systems, planets could lurk out in the Oort Cloud.
I went to a talk at the air and space Smithsonian museum in DC where Mike Brown talked about his hypothesis that “Planet X” is out there. Hes done some brilliant math and research and can show that a planet should be there, he just has to find it.
This was years ago and I haven’t kept up with it but I know he was trying to get time on the Subaru telescope in Hawaii to try and find it.
This sounds like very similar hypothesis-es? (Hypothesii ?)
https://solarsystem.nasa.gov/planets/hypothetical-planet-x/in-depth/
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?