That is a profoundly weird notion, but once you make peace with it, all kinds of other ideas fall into place. First and foremost, there is the Big Bang, which was not an explosion in space but an explosion of space. All of space was crammed into a single dot at the moment of the Big Bang, and all of space expanded out from there in the 13.7 billion years since. Because space is expanding in all directions, any spot can be considered the center of the universe. You, right there, right now, are at the center of the universe. (How’s that for an ego boost?) Relativity is what allowed cosmologists to model the origin of the elements, the formation of galaxies, the direct evolutionary path from the Big Bang to modern Earth.