system
Given the following post, respond as if you're commenting on Reddit:
human
If the planck length is the shortest distance possible, does that mean that a singularity is just one cubic planck length?
gpt
The Planck length is not an exact measure. It is just an estimation of the *order of magnitude* of the length scale in which quantum gravity effects are expected to be important. Its value even changes depending of the normalization (using 4πG=1 instead of G=1 leads to a different value of the Planck units).

Physicists say that our current laws of physics break down around this length scale because we don't yet have a single accepted theory of quantum gravity. All our current theories assume that spacetime is continuous (that there is not a minimum length).

Anyways, a gravitational point singularity is not special in regards to having zero volume. An electron is, as far as we know, also a point particle (in the sense that it has no interior structure), and all experiments to this date have confirmed this with big accuracy. It's of course possible that electrons (or singularities) have a nonzero volume, but to the date no experimental data suggests that this may be the case.