The team came to this conclusion after analyzing the trajectories of 50 Kuiper Belt objects (KBOs) and discovering that they were tilted by around 15 degrees compared with the rest of the solar system's planets. The only thing that could explain this tilt was a hidden world, they argued.
this post was submitted on 14 Oct 2025
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Be funny if we share an orbit with another Earth that is exactly in sync to stay behind the sun.
like gore?
That would be quite a surprising find indeed. I'm pretty sure that we would have already observed the gravitational effects of such a planet though. The Planet X and Planet Y the article refers to are out on the fringes of the solar system with Pluto, which is still pretty neat I think.
Marvel did it!
It'd be funnier if it somehow had humans evolved and progressed completely differently from us.
Prof. Sam Lawler, cited in the article as a critic/skeptic, is very active on Mastodon @sundogplanets@mastodon.social and interesting to follow.
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.
Planet Y Are You So Hard to Find?
Its probably a tiny black hole that's cleaning the debris around the sun.
Isn't planet nine Uranus?
1 Mercury.
2 Venus.
3 Earth.
4 Mars.
5 Jupiter.
6 Saturn.
7 Uranus.
8 Neptune.
No no, it's Mercury, Venus, Mars, Jupiter, Saturn, The Sun, and The Moon. The seven planets, and days of the week.
— Ancient People
Happy Day of Odin to you!
Same to you, fellow!
I love the ever permanent comet in that image. I like to think it somehow has a tail, yet sits in orbit
All planets have elliptical orbits just like periodic comets. Comets' elliptic is just more extreme.
Mercury, Mars and Venus have tails, they just aren't as visible.
While I understand they are all elliptical, isn't that the reason they moved Pluto to a dwarf planet, because it's orbit was "to elliptical" and crossing Neptune's orbital path?
Its orbit is also at a considerable angle relative to the plane all other planets orbit in. That alone made me question it's planet-ness long before it got demoted. And I felt really validated when Jim Carrey's kids in Me, Myself and Irene argued about Pluto being a planet or not.
Plus there are other additional bodies similar to Pluto that didn’t make sense to call planets