[Taqwus]

Hrm. _Domed_ colonies perhaps should still be fairly vulnerable. Even if you assume that this refers to multiple domes (you pretty much have to, for colonies on the scale of SE4's), breaching domes would still be far easier than trying to bombard 500M with acid, DU, missiles or what-not.

(Perhaps a new facility: underground shelter? Provides refuge for some limited pop against plagues and fairly high resistance against orbital bombardment of most kinds. Not sure how to reconcile it with gas giants, 'tho...)

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-- The thing that goes bump in the night