I was thinking about last night's episode -- episode #2. We now know that the dome is penetrable -- by radio waves in certain places and by water. Because water can get through then oxygen gets through so the people under the dome will not suffocate.

None of the "dome people" had a seizure in episode #2 so we didn't get any more clues about "the stars" but in the previews we see more seizures in episode #3.

After two episodes I'll say it's a good show... but if Revolution were on in the same time slot, I'd be watching Revolution.