[member="sabrina"] - Just wing it. If it's a canon planet, go wild but don't expect to destroy one. If it's a player planet, you'd need permission from the author to do anything to it that would in any way change the state of how it is as written in the submission. As with before, don't expect to destroy one.
Also, be prepared to understand that if you're doing weapons testing on a planet someone cares about, or worse yet near populations or valuable species, expect a serious IC backlash from other players and factions.