i have an idea... add a "destroy" option to planet invasions. if successful, the planet goes BOOM! and massive amounts of resources pill out into the system. somehow, from the segments a nearly endless supply of resources is available to the colonists... (mining) so it makes sense that a lot would pop out when it goes boom. players could even build planets just to blow them up. if u guys actually like this suggestion, then i think, going with it, should be the ability to load and unload colonists from ships.
btw i disagree with random reseeding. there should be a mechanic for it. the mechanic can be what i suggested or something less game-tangible, like passing commits or alien invaders... but i don't want to just randomly have stuff popup in my, or any one else's systems.