The Good Stuff | Are We About to Discover a Ninth Planet . . . Again? @TheGoodStuff | Uploaded March 2017 | Updated October 2024, 4 days ago.
And what the heck is a planet anyway??

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Kevin MacLeod
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References:
space.com/34455-planet-nine-discovery-coming-soon.html
wired.com/2017/03/pluto-thing
en.wikipedia.org/wiki/Planets_beyond_Neptune
en.wikipedia.org/wiki/List_of_hypothetical_Solar_System_objects#Planets
en.wikipedia.org/wiki/Planet_Nine
en.wikipedia.org/wiki/Percival_Lowell
space.com/19824-clyde-tombaugh.html
nydailynews.com/news/national/planet-x-nibiru-headed-earth-doomsayers-article-1.2504846
en.wikipedia.org/wiki/Fictional_planets_of_the_Solar_System#Trans-Neptunian_planets
nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-pluto-k4.html
en.wikipedia.org/wiki/Pluto#Classification
en.wikipedia.org/wiki/Exoplanet
en.wikipedia.org/wiki/Discovery_of_Neptune