this post was submitted on 07 Mar 2025
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Today I Learned

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This hypothesized ninth planet (not you, sorry Pluto) might explain the unusual commonalities of extreme trans-Neptunian objects (ETNOs) 100s of AU from the sun. These ETNOs (such as dwarf planets and sednoids) have remarkably aligned orbits, suggest the existence of an undiscovered celestial body, dubbed Planet Nine, influencing them gravitationally.

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[–] [email protected] 7 points 20 hours ago

I cant believe they are turning Neptunian objects extremely trans

[–] [email protected] 57 points 1 day ago (4 children)

Back in my day is was called Planet X. Sad

[–] [email protected] 5 points 1 day ago

Musk ruined the mystique of that letter

[–] [email protected] 5 points 1 day ago (1 children)

I thought Planet X was a hypothetical inner planet?

[–] [email protected] 4 points 1 day ago

Nah, it's the same thing. Just renamed to planet nine now.

[–] [email protected] 3 points 1 day ago (1 children)

Well without Pluto it would be planet 9 not 10

[–] [email protected] 3 points 1 day ago

X is so much more than just the Roman numeral.

[–] [email protected] 1 points 1 day ago

I know right. Why do they always have to rename stuff. Isn't there enough new stuff to name?

[–] [email protected] 8 points 1 day ago (1 children)

Get the space platforms ready lads were going to the shattered planet.

[–] [email protected] 3 points 1 day ago

Get your biter eggs on board. We gonna make promethium science.

[–] [email protected] 14 points 1 day ago

There's the even more hypothetical and highly theoretical Planet Eleven. It's so obscure there aren't even rumors about it.

[–] [email protected] 59 points 1 day ago (6 children)

Pluto will always be the ninth planet in my book.

[–] [email protected] 29 points 1 day ago (3 children)

Even if it’s a dwarf planet, it’s still a planet. It’s right there in the name: dwarf planet.

This article should be about “Planet 18” since Wikipedia recognizes 17 planets already.

[–] [email protected] 6 points 1 day ago (1 children)

Do you put butterflies on your toast?

[–] [email protected] 2 points 1 day ago

Free protein!

[–] [email protected] 8 points 1 day ago
[–] [email protected] 2 points 1 day ago (1 children)

It's closer to planet 1.4 million if you include the rest of the dwarf parts and minor planets under the same logic. It gets a little hard to remember all the names at that point though.

[–] [email protected] 3 points 1 day ago

Challenge accepted!

[–] [email protected] 9 points 1 day ago* (last edited 1 day ago) (1 children)

I prefer to think of Pluto as the king of the dwarf planets and namesake of the Plutoids, rather than as a weird lesser planet not appreciably bigger than its moon.

[–] [email protected] 4 points 1 day ago

I see Pluto and Charon as Irish twins. Or at least 2 under 2. I somehow always imagine two siblings spinning around each other. Maybe Pluto is showing a 🫶 to his little sister.

[–] [email protected] 7 points 1 day ago (1 children)

Pluto is hypothetically a planet.

[–] [email protected] 10 points 1 day ago

Oh yeah, well you’re hypothetically correct.

[–] [email protected] 4 points 1 day ago

Pluto for life.

[–] [email protected] 2 points 1 day ago (1 children)

It can't be the ninth planet. It literally can't. It's either not a planet, or its the tenth planet.

[–] [email protected] 6 points 1 day ago (1 children)

Everyone forgetting about my boy, Ceres.

[–] [email protected] 3 points 1 day ago

Exactly! Fair enough if you want to define a planet as "anything big enough to be rounded by self-gravity, but too small to undergo fusion in its core." But there is no definition of a planet, (or at least one without an arbitrary rule like "planets have to be X km in diameter,) that allows Pluto to be a planet without Ceres also being a planet.

[–] [email protected] 1 points 1 day ago* (last edited 1 day ago)

Yeah, I have a lot of outdated books too.

Edit: I guess people don't enjoy book puns?

[–] [email protected] 18 points 1 day ago (4 children)

You hear what they did to Pluto? That’s messed up

[–] [email protected] 2 points 1 day ago

My go-to conversation started with the ladies

[–] [email protected] 5 points 1 day ago
[–] [email protected] 3 points 1 day ago

Come on son!

[–] [email protected] 10 points 1 day ago (2 children)

Potentially stupid question: Granted that we have such good vision for planets an incomprehensible distance away from us, why wouldn’t we be able to detect, with certainty, if this planet is actually present in our system? I’m guessing it would take longer to orbit around the sun, than Pluto’s 247 years, but it’d still be detectable because of the distance away from us

[–] [email protected] 33 points 1 day ago (1 children)

The problem is the potential planet is so far that it would barely reflect any light. We have inferred from computer models that for known planet and object orbits in our neck of the woods, there needs to be a planet there to create those orbits.

We just can't see it because it's so far out there, it's really really dark, and it doesn't pass in front of a star to see the dimming effect that would let us know it's there. If we knew where to exactly point telescopes, it's possible with enough study we could say it's really there.

[–] [email protected] 8 points 1 day ago

That makes sense. Thanks for the answer!

[–] [email protected] 10 points 1 day ago

Not a stupid question.

Beyond the too far to reflect light aspect, the evidence we do have is gravitational effects to other bodies we can see and track. So there is evidence that something is out there. It's just a matter of what and exactly where.

[–] [email protected] 16 points 1 day ago (1 children)
[–] [email protected] 3 points 1 day ago (1 children)

Probably one of the greatest cinematic masterpieces.

[–] [email protected] 2 points 1 day ago (1 children)

You’ve never seen Kraven the Hunter and it shows.

[–] [email protected] 2 points 1 day ago

Sorry I'm not into art house

[–] [email protected] 12 points 1 day ago

Nibiru who come around every few thousand years so the ( i think reptilian ) that live on it can harvest our gold ans human for slavery

It's a nice rabbit hole to follow

[–] [email protected] 5 points 1 day ago

If you wanna get really tin-foiled about it, Planet X and a dead star beyond the belt

[–] [email protected] 3 points 1 day ago (2 children)

Also confer this very topical article

[–] [email protected] 2 points 1 day ago (1 children)
[–] [email protected] 2 points 15 hours ago

You're very welcome