The Milky Way is what's known as a Magical Dead Zone, being one of the only zones within the universe like this on such a massive scale. Use the Removing Magic rules when running adventures in the Milky Way. Earth (also sometimes referred to as Terra) remains isolated from outsider events with YHVH making an active effort to segment it from interactions with potential rivals and organizations in the Milky Way which may wish to do harm or conquer Earth.