Yeah, the asteroids are modelled objects (they're also animated so that they constantly intermingle with each other). I'm trying to make the terrain as busy as possible to detract from the emptiness of space a bit. Fortunately, you can get over 400 of these asteroid clusters on screen at once without any significant decrease in frame rate on the highest graphical settings, which means when the number is decreased a lot, we can play with even more memory eaters
