Hello. I turned off the realistic setting on my star, made it how I wanted it, then saved the simulation after I did what I wanted to my star system. when I reloaded it, my star instantly exploded and I checked it and the "realistic" option was active. This is unbelievable that a setting that you save "off" would turn "on" when you load the save. That is the whole point of saving certain setting so that they will still be there when you load the file. I hope this is just a bug that will be fix in a update that should come soon and not a game feature meant to stay.