I just tried this out, and found that a quick way of doing this is to bypass almost everything inside the material, and hook it directly into the emmissive slot, no need to modify UV’s or anything for a quick and simple space sphere
If you don’t want the sun at all ever, instead only stars you can edit the material like this:
This is the part of the material that controls the stars, everything else is not necessary to use for a space sky, so disconnect the wire that is connected to the main material node, and then move that node down beside the area circled.
Pull out the wire from the multiply node shown and connect this wire to the emmissive slot on the main material input, you will see in your preview that there is now a 360 degree sphere of stars. Apply the changes and save the material, and that’s it you have a (basic) but working space sphere.
One last thing to do is in your main scene delete the AtmosphericFog and it should show up properly.
There are many ways of improving , for instance you can replace the stars texture with other textures of the stars, and even throw in a few sphere’s with a texture of a planet applied, or whatever you’d like. Hope that helps. 