Unreal Engine 5 project file with planets and a nebula skybox. The planets have one material for their poles and clouds, and for the surface all planets have individual materials. The planets do have cloud layers with proper material, but it doesn't look so good (I have to do more research on it) so it's disabled by default.
Stardust Sky 1https://www.artstation.com/artwork/6b4Pm5
Stardust Sky 2https://www.artstation.com/artwork/yJrZR8
Stardust Sky 3https://www.artstation.com/artwork/wJzEN5
Stardust Sky 4https://www.artstation.com/artwork/kl5Van
Stardust Sky 6https://www.artstation.com/artwork/LR5YgK
Stardust Sky 7https://www.artstation.com/artwork/9EwqZR
Stardust Sky 8https://www.artstation.com/artwork/elao4X
Stardust Sky 9https://www.artstation.com/artwork/OGmQxw
Stardust Sky 10https://www.artstation.com/artwork/BX3b26