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How exactly were the Portal Storms created? Did killing Nihilanth cause the portal he was keeping open to become unstable and the side effect was portals opening up worldwide? Or did the resonance cascade cause the portal storms? But I thought by launching the Lamda(?) Satellite, we managed to stop it and the only portals open were being kept open by Nihilanth?
And the second part to this question, how did the Combine detect earth and invade it?