this post was submitted on 14 Oct 2025
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[–] Blackmist@feddit.uk 7 points 20 hours ago (1 children)

Be funny if we share an orbit with another Earth that is exactly in sync to stay behind the sun.

[–] BeMoreCareful@lemmy.world 1 points 16 hours ago

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.

[–] Akt0@reddthat.com 12 points 1 day 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.

[–] sundray@lemmus.org 11 points 1 day ago

Planet Y Are You So Hard to Find?

[–] altphoto@lemmy.today 2 points 22 hours ago

Its probably a tiny black hole that's cleaning the debris around the sun.

[–] 0x0@lemmy.zip 2 points 1 day ago (2 children)
[–] Akt0@reddthat.com 6 points 1 day ago* (last edited 1 day ago)

Uranus is the 7th planet, followed by Neptune.

Wikipedia on Planet 9

edit: added Planet 9 article

[–] RegularJoe@lemmy.world 2 points 1 day ago (2 children)

1 Mercury.

2 Venus.

3 Earth.

4 Mars.

5 Jupiter.

6 Saturn.

7 Uranus.

8 Neptune.

[–] victorz@lemmy.world 7 points 1 day ago (1 children)

No no, it's Mercury, Venus, Mars, Jupiter, Saturn, The Sun, and The Moon. The seven planets, and days of the week.

— Ancient People

[–] WoodScientist@lemmy.world 1 points 22 hours ago (1 children)
[–] victorz@lemmy.world 1 points 17 hours ago

Same to you, fellow!

[–] LifeInMultipleChoice@lemmy.world 4 points 1 day ago (1 children)

I love the ever permanent comet in that image. I like to think it somehow has a tail, yet sits in orbit

[–] Blue_Morpho@lemmy.world 5 points 1 day ago (1 children)

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.

[–] LifeInMultipleChoice@lemmy.world 2 points 1 day ago* (last edited 1 day ago) (2 children)

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?

[–] AA5B@lemmy.world 3 points 1 day ago

Plus there are other additional bodies similar to Pluto that didn’t make sense to call planets

[–] bjoern_tantau@swg-empire.de 3 points 1 day ago

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.