what you can do there is just repeat the texture in the materials tag…
1- Click the Material apply on the Sky object.
2- Click “Tag”
3- Reduce ” Length U ” & ” Length V ” ’till you find the right setting for the scene.
it will work even better if is a ” Seamless Starfield Texture ”
P.S. i saw you have check Specular on the Material, you better off Unchecking that 🙂