Im trying to make a larger scale space map but the planet would completely destroy the aspect ratio. Any way to just have the stars as the background?

Import a new background image like you want into the path the current one is. You'll need an MPQ editor and someone to make that image for you, though.

Or then there could be an easier way which I am not familiar with.

You could probably just import it and set the filepath to that of the background image. You might need an MPQ editor to find that filepath, though.