check distance from every object optimization

hello everyone, before i write this code i wanted to know what would be a good idea in terms of optimization, here is what i want: i`m making a space game, but i cant make planets bigger without reducing their amount or placing each one in a separate sceene, so checking in my old questions i found someone told me i could scale the object as it got near, having a smaller solar sistem seem bigger, so what would be better, have a script on the player using a foreach (GameObjects p in planets) check the distance and scale every planet, have every planet check its distance from the player and scale apropiately or maybe an other option, i apreciate your time and thank you in advanced.