Space box instead of sky box?

Let’s say I have a space station with a couple of small windows in it.
How can I have it so when you look out the window you see space (stars, planets, the sun)?
Will I need to buy something from the marketplace?

You can buy the star-scapes from the marketplace, or you can get Spacescape: Spacescape – Alex Peterson

I made one, with help of thathttps://youtube.com/watch?v=l3sN0ZQDEpY:)

tehres a tutorial on youtube.