system
Given the following post, respond as if you're commenting on Reddit:
human
[Dark Souls] So whats in space?

Is the rest of the universe going through the eternal cycle of life and death or is it all just on this single planet?
gpt
There is very little talk of celestial bodies in the lore, with the Sun and Moon only referred to in their deific forms rather than their position in the skies. One theory is that the land lies in eternal night, and the sun went out as part of the Age of Fire ending (it's illusory whenever you see it). Hence, there are no other worlds besides this one.