The earth is a flat circle sitting under the firmament.
The sun and the moon are under the firmament - not in 'space'.
The planets, stars and constellations are lights that exist only in the firmament.
➛ They have no physical substance.
➛ They are a light show.
There is no known space above the firmament or under the earth.
These are totally unexplorable and subject only to speculation and theory.