system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do hot things tend to emit light?

Do all materials emit light if heated up enough?
gpt
All things emit light all the time. It's just one of the ways materials give off energy to their environment. Thermal imaging works by seeing the light things give off that humans can't detect with their eyes.

Anything, if heated up enough, will begin to emit light in the visible part of the spectrum.