Excellent back-of-the-envelope estimation. I've recently been doing some world simulation for games, and found that you quickly start pushing RAM limits if you

Excellent back-of-the-envelope estimation. I've recently been doing some world simulation for games, and found that you quickly start pushing RAM limits if you want to represent an Earth-sized planet at square kilometer precision. Turns out the Earth is pretty big. Mars is more reasonable, with about a quarter of the surface area.