This could a good perplexing question for a religious type. According to the text in the book of lies, nirvana (heaven) is up and hades (hell) is down. So when you leave the planets atmosphere and enter space there is no up or down. Does this mean that these places of myth only exist on planets?
Here's what I think is the best picture of the world in the mind of the people of the ancient Near East. Sheol is the equivalent of Hades, later converted to Hell.
I love Terry Prachette's Disc World . I love the puns and his witches . His disc rests on the back of four elephants , who are standing on a tortoise that swims through space .
It means , many centuries ago , when humans were trying to explain things they didn't know , in terms they could understand , they spoke in a way that made sense , to them , at the time .
Once they knew the earth was the center of the universe and that it was flat. We could think why have so few of us evolved (nonbelievers) and the one still adhering to cult-like behavior still repress society