for those wondering if you wanna try the solar system exploration you need to download the unity project on github and load the project on unity :)
ooooo oki oki, thx for letting us know
wait... i have no idea how to use unity ;-; Time to learn!
making a custom solar system with his project was really pain so good luck if you dont know unity :(
btw if you wanna see a custom solar system check out my profile and download the zip
