@Alireza-iran When I said stars it means stars, not 'stars' :blush: You should experience it yourself. First, read some books in print or on-screen to know more about the space. Then simply download and install the app. Sky Map for android. Use the search part of this app, type in sun, jupiter, mars or moon...anything.... then follow the circle arrow. Hold up the sky map and see if you can match a pattern of stars, try to recognize the stars, and the constellation too.. After an hour or so you will notice how the stars have moved... Trust me, its soooo epic! :sparkles: