940
you are viewing a single comment's thread
view the rest of the comments
[-] Alaknar@sopuli.xyz 6 points 6 months ago* (last edited 6 months ago)

There is no objective criteria for what a planet is and isn’t

There are - exactly three.

  1. is in orbit around a star,
  2. has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
  3. has "cleared the neighbourhood" around its orbit.

The last one means that its gravitational pull has removed any smaller objects that might be in its orbit, either by kicking them out of it, or by catching them as moons.

Pluto's orbit is full of debris.

[-] JackbyDev@programming.dev 9 points 5 months ago

There is no objective criteria for what a planet is and isn't. Like a lot of things in nature, things just exist, and as humans we categorize them.

You're the second person to ignore the sentence immediately following that.

[-] Alaknar@sopuli.xyz 1 points 5 months ago

Because that sentence doesn't really make sense. "Criteria" is a human concept. Nature doesn't do "criteria", nor "objective" for that matter. So, yes, there's no "natural criteria" for when something is X or Y, we, humans, make those criteria. Doesn't matter if it's in relation to animals, plants, or planets.

[-] JackbyDev@programming.dev 5 points 5 months ago

So you're saying things just exist, and as humans we categorize them? Because that's what I said.

[-] Alaknar@sopuli.xyz 2 points 5 months ago

The idea of a "category" is inherently human. Just like "objective" and "criteria".

Which means there is objective criteria for what is categorised as a planet - it's whatever we, humans, define them to be.

[-] JackbyDev@programming.dev 4 points 5 months ago

Not objective in the sense that aliens would come to the same definition for what is and isn't a planet. Compare that to something like what the elements are.

this post was submitted on 07 Jan 2026
940 points (100.0% liked)

Science Memes

20648 readers
1369 users here now

Welcome to c/science_memes @ Mander.xyz!

A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.



Meta Post Tags



Rules

  1. Don't throw mud. Behave like an intellectual and remember the human.
  2. Keep it rooted (on topic).
  3. No spam.
  4. Infographics welcome, get schooled.


If you are here asking: "Is this a science meme?"

Probably, yes. We use the Dawkins definition of meme: a replicating idea, not just an image macro with a fact on it. A good post here doesn't need to teach you something. It needs to make you ask something: who, what, where, when, and especially why or how.

Science isn't a filing cabinet of facts, it's a conversation. For example, a photo of an eel or other localized wildlife counts because most people never see one, and wonder is the first step of inquiry. A car meme counts if it makes you curious about what's under the bonnet. If you want to talk about something you noticed in the world, chances are someone else wants to talk about it too.

We moderate for vibe, not category. Pruning is light, especially where a post creates interesting discussion. Experimenting is encouraged.

See the pinned paper on Shitposting as Public Pedagogy if you want the academic case for why this works.



Research Committee

Other Mander Communities

Science and Research

Biology and Life Sciences

Physical Sciences

Humanities and Social Sciences

Practical and Applied Sciences

Memes

Miscellaneous

founded 3 years ago
MODERATORS