Celestia Forums

Are there any tutorials on how to make cloud textures
with Photoshop Cs2?
I'm making a star system and one planet has clouds.

There are lots of them. Google is your friend

Celestia's clouds are technically relatively simple: a simple-cylindrical image with an alpha opacity channel (CloudMap). An optional normal map (CloudNormalMap) has been added in Celestia v1.5.0.