If the cultivation world really was in the same universe as earth, at the very least it wouldn't be anywhere near the same part of the universe, as Di Tou had looked around and stared at the night sky many a time and had never seen any familiar stars or constellations. Although, of course, Di Tou wasn't an astrologist, and he would probably have trouble pointing out stars even if he was on Earth, so perhaps that didn't mean much.
If it wasn't a planet, what was the world of cultivation? He had heard before of big floating continents, or even 'realms' where the sky was more of an illusion, but it wasn't anything Di Tou was familiar with, and overall he still thought that the cultivation world should be a planet in a universe, just like Earth.
After all, if nothing else, [Seven Star Springs] had allowed him to see the vision of a grand universe, and he had also seen such a thing when ascending to the Nascent Soul Stage.
