How to create Open World the size of a solar system ?

#1
I want to create an open world the size of a star system :3 (1 star, 4 planet ) .
The sizes of the planets are approximately equal to the earth.
There any examples or tutorial how to do this ??

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I can give as an example: No Man’s Sky . But i don't need multiplayer mode and different star systems. I need only one star system.

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