Does Planet 9 Exist? Veritasium : Season 10 Episode 24
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Aired: September 13th, 2019 @ 12:00 AM EST on YouTube
A planet has been predicted to orbit the sun with a period of 10,000 years, a mass 5x that of Earth on a highly elliptical and inclined orbit. What evidence supports the existence of such a strange object at the edge of our solar system?