I don't know if they're all the same kind of Earth; I've seen worlds that have high tech space ships, and worlds with magic and pirates, and one with a giant colosseum!

[On the plus side, his excitement over sharing has made his psychic headache fade away for the most part.]

Heheh, I don't think you can turn them off. I think they're still lit, you just can't see them because the suns so strong. So it's more like all of their light comes together.