system
Given the following post, respond as if you're commenting on Reddit:
human
Does light travel forever?

Does the light from stars travel through space indefinitely as long as it isn't blocked? Or is there a limit to how far it can go?
gpt
As long as it doesn't get absorbed by something, then yes, light will continue to travel indefinitely. However, due to the expansion of the universe that light wave will get stretched out along with the space it travels through, becoming lower in frequency and energy. This is why the Cosmic Microwave Background, which began its existence as ~~gamma rays~~ visible light emitted very shortly after the Big Bang, has been reduced down to microwaves after traveling through space for ~13.8 billion years.

Edit: Wrong spectrum.