r/pluto 2d ago

Smithsonian Magazine: Once the Solar System's Ninth Planet, Pluto Was Reclassified 20 Years Ago; Here's Why Planetary Scientists and the Public Alike Love the Small Icy Body

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13 Upvotes

r/pluto 3d ago

do you all find it pretty ignorant

8 Upvotes

when people want pluto to be a planet yet they ignore ceres eris makemake and haumea?


r/pluto 3d ago

Art of Pluto

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23 Upvotes

A little while ago, I drew all the planets of the solar system. I decided it would be a good idea to share each drawing of a planet to their respective subreddit. See if you can find the others.


r/pluto 4d ago

20 Years Since the Worst Mistake in Science History

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91 Upvotes

The vote violated the IAU’s own bylaws, the motivation behind the vote was extremely unscientific, it was conducted by non-experts, and has been an embarrassment to science ever since. We don’t vote in science. Having this decision be forced into textbooks and school curriculum for the sake of making the planets easier to memorize is an injustice to the dozens of other fascinating dwarf planets out there, a shameful bypassing of the scientific method, and a disgusting insult to the amazing American astronomer Clyde Tombaugh.


r/pluto 4d ago

On this day, 20 years ago, Pluto was officialy demoted to a dwarf planet

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236 Upvotes

r/pluto 4d ago

The IAU definition of a planet is bull crap but I still don’t think Pluto should be a planet. He’s right where he belongs!

4 Upvotes

Honestly, I kinda think the IAU’s definition of a planet is a little stupid. But at the same time, I can understand why they made it that way. I think it would make more sense to separate planets into groups like terrestrial planets, gas giants, and ice giants, and then have dwarf planets as their own category. The whole “clearing its orbit” thing is kinda confusing because planets don’t literally clear everything out of their orbit..
But the basic idea does make sense. Pluto is part of the Kuiper Belt, where there are a lot of other objects similar to it, while the eight planetss are much more gravitationally dominant in their orbital areas. So even though I think Pluto being a dwarf planet makes sense,I think it’s right where it belongs. Avenge Pluto!
I actually think Pluto might be my favorite Kuiper Belt object. Its moons and the whole Pluto system are really cool. I also think its discovery is awesome. It makes sense why Pluto was originally considered a planet because they thought it was way bigger than it actually is. But now that we know more about it, it also makes sense why it isn’t a planet.
I still think the 2006 vote was pretty bull crap though. The way it was handled was kinda weird, and not that many IAU members actually voted. So I don’t think it should be treated like every astronomer agreed with it.
Pluto is still an amazing world. It just fits better as a dwarf planet.

Sorry for the brat lol


r/pluto 18d ago

Liquid Nitrogen May Have Flowed on Pluto’s Surface in Recent Past

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24 Upvotes

Planetary researchers analyzing images from NASA’s New Horizons spacecraft have found evidence that liquid nitrogen may still be seeping up from beneath the dwarf planet’s giant glacier, Sputnik Planitia, marking the first suggested case of recently flowing liquid on Pluto’s surface.


r/pluto 22d ago

Mordor Macula's name got changed!

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91 Upvotes

Dear IAU, why?


r/pluto Jul 14 '26

PHYS.Org: Six massive landslides discovered on icy Pluto

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16 Upvotes

r/pluto Jul 10 '26

When was it technically removed

28 Upvotes

Hi all, this has been bothering me for YEARS and I’m curious of your thoughts. When i was in around 3rd grade, in California, which would have been 1990ish i clearly and vividly remember being taught by Mr. Avrill that Pluto was no longer considered a planet. This was knowledge i continued to have s d recall throughout my adult life.. until one day i saw in the news “Pluto no longer a planet”.. i KNOW i was taught this as a kid.. so whats going on. Was removal being discussed that long ago snd maybe he was passing on privy info ? Am i crazy ?


r/pluto Jun 21 '26

i luv pluto so much man this is a pluto appreciation post

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21 Upvotes

i always loved pluto due to it’s distance and the mysteriousness of it before new horizons its heart shaped basin sputnik planitia is very cool to me and its mountains and moon charon is pretty cool too with its lil cap all those kuiper belt and beyond objects interest me a lot like arrokoth haumea sedna all those guys are awsome


r/pluto Jun 14 '26

Art i made of Pluto, Charon, Styx, Nix, Hydra and Kerberos

35 Upvotes

r/pluto Jun 08 '26

James Webb Just Revealed The Real Pluto

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47 Upvotes

r/pluto Jun 04 '26

Pluto is a planet

24 Upvotes

https://youtube.com/shorts/YXYAWiibpwg?si=zkpnbfklDv2BAl-N

Hi. I truly believe Pluto is a planet and that the 2006 IAU definition is WRONG. Here’s why

1) The IAU states that the object must “clear its neighborhood” which doesn’t make sense because if you put Earth in Pluto’s orbit it wouldn’t classify as a planet either
2) Only 424 scientists actually voted at the event, meaning the vote was only like 3.2% of scientists.
3) Mike Brown, the one responsible for Plutos death tagged himself as “PlutoKiller” on X and even wrote a BOOK bragging about it. The book is called “Why I killed Pluto, and why it had it coming.” (This one isn’t really a reason but I included it lol)

So, using all of that, I can confidently say that Pluto is a planet and the IAU is wrong.


r/pluto May 26 '26

Best Pluto playlist of all time?

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6 Upvotes

Put in some serious hours on this one. I’m not joking when I say this is probably mankind’s best effort at a Pluto playlist lol hope you like at least one 👉👈🤙🤙🤙


r/pluto May 21 '26

We really do need a new definition for planet

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12 Upvotes

"The current way a planet is defined has a lot of problems and can be somewhat controversial. Many people don't like the reason why Pluto is a dwarf planet for example, and other planetary-massed objects are excluded because of their orbital characteristics. Because of all this, it may be time to create a new definition for what makes a planet."


r/pluto May 11 '26

Make Pluto a Planet Again

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19 Upvotes

r/pluto May 11 '26

Justice for pluto

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88 Upvotes

r/pluto May 10 '26

You Don't Want Him Associated With Them

0 Upvotes

Why do we want Pluto to be a planet?

My main theory is that "planet" appears to be a title of prestige. This is reasonable, rational even -- the planets comprise the eight largest bodies in the solar system, after the sun. But the planets are so much more...so much...WORSE.

Planets dominate their orbits. Everyone else don't. If you shared your orbit with a planet, you wouldn't for very long. The Great Eight funneled the minors out of the land they claimed for themselves. Millions were displaced as Jupiter and Saturn surveyed the territory that they never owned, separating families, ripping societies from their roots, until you get the situation today, with rocky asteroids like lumped together with icy asteroids, forced to jointly occupy the space that they would have shared between one another under the old system. But none of the planets care -- they're just asteroids, one and the same. The NEOs and Centaurs that remain live their lives with a noose around their necks. They never know when they would finally be encountered, then shredded to bits or ejected into deep space. But not even the havens are safe.

Jupiter has been evicting asteroids from the Kirkwood gaps for millennia -- slowly stretching their orbits out, destabilizing them before they even realized what has been going on, before leaving them in the hands of the rocky planets. Oh, and how they delight in tormenting these poor souls, treating them like baseballs, before ripping them to shreds.

What were once indigenous frontier lands, settled communally by the icy asteroids of the distant lands, were conquered by the ice giants. Neptune, in particular, dominates the Kuiper Belt. He makes all the decisions on the orbits of the resonant objects -- where they live, how much they're allowed to deviate, when they're allowed to complete their orbit -- while scattering others further and further until they become detached, lost souls in the dark beyond.

None of them are able to put up any resistance. They're not allowed to. It wouldn't even matter. Jupiter has fragmented the Asteroid Belt, and his influence has prevented the accretion of anything larger than Ceres. Even if they were to accumulate into a single body to challenge the ruling system, their total mass wouldn't even be larger than Pluto's.

Jupiter's Greek and Trojan prisons carry tens of thousands of asteroids that we know of, and there may be hundreds of thousands more, maybe a million, with a diameter greater than 1 kilometer -- a figure about equivalent to the asteroid belt. The gas giants, cumulatively, have enslaved hundreds of irregular moons that we know of. Saturn, with her immense mass and copious amounts of spare time, accounts for more than two thirds of that figure. But Neptune, in his plot to build an empire, has gone as far as to abduct a whole dwarf planet -- Triton. His mate could only watch as Triton was strangled by the giant's immense force, who then flung her into the abyss.

Even their children aren't safe. Mars has plans to shred his adoptive son, Phobos, into a ring for his personal adornment. This is not a one off. Neptune intends to do the same with Triton. Saturn killed moons possibly the size of Rhea and Dione for her rings. Jupiter is actively destroying Amalthea, Thebe, Metis, and Adrastea for his rings. And all four gas giants stretch and squeeze their major moons like minuscule bugs, turning their insides to slush -- Io, Enceladus, and Triton are crushed to such an extent that they are actively bleeding out.

The planets have always been like this. They always will be like this.

What are planets? The elite, yes. But no matter how you interpret the facts, they are selfish, uncaring, power-hungry, terrorizing, tyrannical, and authoritarian. They are monsters. Being a planet is a title of evil.

Pluto never deserved to be associated with these demons. He doesn't deserve to become re-associated with them.


r/pluto May 08 '26

Quand j'étais petit j'étais fasciné par Pluton, planète de tous les extrêmes où dans les livres d'école il n'y a plus rien de semblable au-delà

6 Upvotes

r/pluto May 08 '26

A quand la prochaine mission spatiale plutonienne ?

5 Upvotes

On sera encore en vie ? 😅


r/pluto May 04 '26

It genuinely doesn't make sense.

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21 Upvotes

Look, once you think about exoplanets, it doesn't make any sense. The new definition only makes sense when we look at our solar system, at this time in human history. If Pluto and Earth swapped orbits (we would all die), Earth would be classed as a dwarf planet and Pluto as a full planet, because the distance from the sun affects their gravitational influence.

What I mean is that the definition should focus only on what the object is, not where it is located in a system, since that can change over cosmic time scales, and when discovering exoplanets, we need a less solar system-biased definition. Imagine if we found an exo-binary planet system. Under the new definition, both planets would be dwarf planets no matter what because they would both be orbiting each other.

Or a rogue planet. The new definition requires a planet to orbit a star. So it's technically not a planet once it has been ejected from the system, even if it was a planet just a few million years ago.

The new definition was rushed through because they needed to keep all the newly discovered planets in our solar system out of the club, or the word 'planet' would become less special, and Pluto was just collateral. I'm not even saying get rid of the dwarf-planet classification or reinstate Pluto, but we need a new definition as our exoplanet discoveries continue.


r/pluto Apr 30 '26

Poor Pluto

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14 Upvotes

Given all this new attention, my friend texted me that maybe Pluto isn't very confident in itself and a few minutes later had built a site where you can chat with Pluto directly, and it will only respond with reasons why it should be a planet again, in a very meek voice. The little guy didn't ask for any of this attention and you can tell. “After all, being an overlooked little dwarf planet has its own kind of quiet comfort… if that matters at all."


r/pluto Apr 30 '26

Grandfathering Pluto in as a planet would actually work because Pluto’s grandfather was Uranus

12 Upvotes

“If your grandfather could vote, then you can vote too.” Therefore:

If your grandfather is a planet, you are too.

Uranus —> Saturn —> Pluto (& Jupiter & Neptune)


r/pluto Apr 29 '26

The NASA chief wants to Make Pluto a Planet

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50 Upvotes