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Today's 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-h....

https://web.archive.org/web/201412161...

https://arxiv.org/abs/1601.05438

   • Pluto, Eris, and the Dwarf Planets of...  

https://www.realclearscience.com/list...

https://solarsystem.nasa.gov/planets/...

https://www.nytimes.com/2016/01/21/sc...

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

https://www.newscientist.com/article/...