The Elemental Planes

The Elemental planes are situated in the Primordial Nebula. Said to be Imilios Celestius themself, the nebula is a thick region of space where light is obscured by massive amounts of gas, said to be part of Imilios Celestius themself. These planes manifest themselves inside the Nebula alongside Limbo. The region of space is everchanging, however, 4 consistent regions manifest consitently as large asteroids, meteoroids, dwarf planets, and semi flat terrain floating with a local constant gravity field.
The large amount of gas present in the elemental planes is surprisingly enough to breathe in. It is predicted that there is a large outward pushing force keeping this gas from collapsing in on itself.
These 4 regions of space, known as the elemental planes, have regions connecting each other with a consistent theme.