this post was submitted on 06 Jun 2026
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[–] treesquid@lemmy.world 45 points 2 days ago (2 children)

The Planck length is the shortest measurable length, not the shortest possible length. We have no idea how we'd even go about measuring anything smaller, because we don't understand physics smaller than that. There could be stuff that's smaller, like even more elementary particles that build everything and determine the rules of the physics and particles that we do understand. Or maybe not. Maybe that's the smallest anything can be and there isn't further sub-Planck physics, or maybe it's just turtles all the way down.

[–] gandalf_der_12te@feddit.org 5 points 1 day ago

uhm, so, this is just my uneducated ass talking, but i'm pretty sure that there's no particles that make up ordinary matter below the planck length

and i'm saying this because as you split stuff up, you kinda expect the mass of the constituent elements be smaller than the mass of the total. so if you have smaller mass, you have larger uncertainty. and i think when we talk about the "diameter" of subatomic particles, what we really mean, is the uncertainty of its wave function. and that ironically gets larger when you look at smaller particles.

[–] TypFaffke@feddit.org 9 points 1 day ago

We'll have to wait for the sub-Planck DLC to drop