**Ask a monkey a physics question thread**

[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.