As the title suggests, so my little brother likes to play a lot of video games, I wanted to make a game for him to play and learn about space for his birthday. I was hoping to make something like Celestia or space engine but with a spacecraft which you can travel in, I have the 3d designs for the spaceship, it after two days of searching on the internet, I wasn't able to get what I was looking for can anyone help me make it or can guide me to how I can make it using any prebuilt tools, etc, I got unity and have some knowledge of programming, I don't want to make something grand just some phenomenons and solar system and a little bit of information  I don't wanna make it to share or to upload/sell anywhere just wanna run it on PC or android,