Well, in my archive, i have found a interesting old free software who cannot be find anymore on the internet... http://www.love-from-russia.be/galaxy01.zip ...
These little thing generate a random galaxy with 1 million star and allow to navigate it... now, need only to find somebody for build a game engine over it...
Well, i use a other commercial software who is very fun too... it is called universe sandbox ... http://store.steampowered.com/app/72200/ ... i really like to play god and destroy full galaxy...
Point is that it is not the amount of planet/star who is killing the computer resource with soase... but what happen on planet ( upgrade, population, health, artifact, orbital structure, etc ) and everything who fly between planet ( military fleet, numerous trade/refinery ship ) ...
for a almost not ending game, you can maybe modify the ship speed to be more realistic... jump between planet who take months, jump between star who take years... a soase game will take a few lifetime... you begin the game and the next generation finish it...
