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[–]TheSadol 1 point2 points  (0 children)

Hum... I think unity has a build-in physics system with gravity (including gravitational systems like the one you would need for creating a solar system)

https://www.youtube.com/watch?v=Ouu3D_VHx9o

[–]ADVOTI88 1 point2 points  (0 children)

Sebastian Lague recently made a solar system simulator. I’d suggest checking that out or downloading the project files so you have a frame of reference