I'm trying to put together some rules for using variant terrain and I'd like to get some ideas, both on types of terrain to include as well as a couple types that I can't decide what they should do in the game. The overriding goal is to keep things as simple as possible. I want this to seamlessly integrate into the x-wing rules set. I've already got Ion Storms and Nebulae (as well as the official obstacles; asteroids, debris clouds and derelict huge ships), but I's stuck on Comets and Planets. What sorts of effects should comets and planets have on ships in the game.
Also, do you have any ideas for other types of terrain that could be present?

