this post was submitted on 14 Oct 2025
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'Planet Y' theory hints at hidden Earth-size world lurking in the solar system — and it could be much closer to us than 'Planet Nine' (www.livescience.com)
submitted 6 months ago by RegularJoe@lemmy.world to c/science@lemmy.world
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[–] Akt0@reddthat.com 8 points 6 months ago* (last edited 6 months ago)

Uranus is the 7th planet, followed by Neptune.

Wikipedia on Planet 9

edit: added Planet 9 article