Found It

The black hole was a very precise object. Its interior had to be shaped like a perfect ball. Only then could it continuously devour everything within its range.

If the black hole was a cube, the gravitational force of the black hole would probably turn into a funny shape and matter would probably not be swallowed by it.

Wei Huo finally arrived at the core of the black hole. He could not see anything, but he sensed around and felt a ball. It was about the size of a proton, but its mass was the combined mass of 100 million Solar Systems.

Besides, the proton-sized ball was still collapsing. The molecular structure of the ball had been completely destroyed. What were the tiny particles that made up the ball?

No one knew, and neither did Wei Huo.