What is the universe expanding into?

What is the universe expanding into? Euan TobinEdinburgh, Scotland This excellent question forces us to confront a region beyond the bounds of our intuition, so please bear with me. When you inflate a balloon, the balloon’s membrane moves outward, closer to the boundaries of whatever room encloses it. You can easily visualize this expansion becauseContinue reading “What is the universe expanding into?”
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