bnewton81 wrote:I'm thinking of doing a texture of a star field which is easy enough and will look fine tiled, and using decals of planets, moons, comets, nebulae etc. Am i on the right track with that thinking?
Yes.
You never see all of a skydome at the same time in the game, at best you only see a third of it. So tilling (and possibly decals to add details) is definitely a right way to go. Unless your Age doesn't use a lot of textures, in which case you can allow to create a very large non-tilling sky texture; but in most cases a tiling texture is the way to go.
[edit] to make my point clearer: because you never see all of the skydome at the same time you can get away with a tiling texture because you will never see the tiling effect on the screen anyway; no need to use a large non-tiling texture. That's how most Cyan skydomes are (Cleft, Teledahn etc)