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 5 months ago by RegularJoe@lemmy.world to c/science@lemmy.world
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[–] Akt0@reddthat.com 14 points 5 months ago

It seems as though Planet Y is an alternate theory to Planet X, which are both hypothetical 9th planets. The headline makes it sound like they theorize 10 planets already.