will there be craters on planets went a asteroids hit the planet. >.>
I believe so. It certainly won't be the flat bright spot that we get now.
Also, they'll have to make sure Gas Giants don't have actual craters since theres no surface to speak of, unless you go to the extreme depths maybe. Having a graphical effect similar to what happened with Jupiter when Shoemaker-Levy broke up and smacked into it would work.