From Atlas Pro.

Originally posted to the Astro Pro channel on January 25, 2023.

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Today we’re looking at the popular myth of Planet X and seeing if there could be any truth behind the claims of there being a ninth planet.

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Sources / Further Reading

https://www.history.com/this-day-in-history/pluto-discovered#:~:text=However%2C%20in%201929%2C%20using%20the,combined%20with%20a%20blink%20microscope.

https://web.archive.org/web/20141216183818/http://home.dtm.ciw.edu/users/sheppard/pub/TrujilloSheppard2014.pdf

https://arxiv.org/abs/1601.05438

https://www.realclearscience.com/lists/unsolved_problems_in_astronomy/kuiper_cliff.html

https://solarsystem.nasa.gov/planets/hypothetical-planet-x/in-depth/

https://www.nytimes.com/2016/01/21/science/space/ninth-planet-solar-system-beyond-pluto.html

https://arxiv.org/abs/astro-ph/0404456

https://www.newscientist.com/article/mg19726381-600-the-mystery-of-planet-x/