**Ask a monkey a physics question thread**

[OngBonga]

Now, let yourself move away from black holes and think about an electron.

I was talking about this with my friend earlier, and I decided that the singularity must have a very small volume, rather than zero... ie a sphere with radius of one Planck length. I guess the same must be true of an electron.

That's one reason I'm always quick to point out that QM spin is not other spins.

Can it be tought of more as 4D spin? I can visualise the roatation of a hypercube, is this sort of what electrons do?

Aside from that, are you bothered by the center of a spinning rigid object?

Good question. I'll assume a perfect sphere under no other influence. What is the exact centre doing? It must be rotating because the rest of the sphere is doing so, and in a measureable way.

[CoccoBill]

I'll assume a perfect sphere under no other influence. What is the exact centre doing? It must be rotating because the rest of the sphere is doing so, and in a measureable way.

I'd think the exact center point is with a high probability empty, so it wouldn't be doing anything. If there happens to be an electron or a muon or whatever other weird crap, idk.

[MadMojoMonkey]

I'd think the exact center point is with a high probability empty, so it wouldn't be doing anything. If there happens to be an electron or a muon or whatever other weird crap, idk.

Practically, you're probably right, and the thing at the center would have a complicated motion; it wouldn't be sitting there.

Still, I think ongie's talking about the center of a theoretically homogenous solid.
A homogenous solid is "infinitely cuttable without losing any of its properties."
It's a model frequently used in materials science and fluid dynamics, so most of engineering.

Even if it's not reality, the question is interesting.