system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we think black holes are anything more than just super dense balls of matter?
gpt
When we try to understand them by using math, we end up having to plug things like infinity and zero into our equations, which breaks them and we don't get any sort of real or useful answer. Before the equations break down though, some weird things start happening like the warping of space and time. We also can't see inside them because their gravity is so strong that any light that gets too close to them gets pulled in.