well, first you might want to consider speaking in clear sentences (most ppl here are grammer nazis.

) but for your idea, that would be rather fun. i dont really see why its capped at 15x, not 18x, but that would be rather interesting to see a planet evolution occur. especially if the bar wasnt set so high... like one at 5x mega, 10x mega, 15x mega. that seems more reachable than 20x, then 30x, and then i assume 40x.