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I asked this ages ago, but it is always worth thinking about.
We know the boundary of the Universe is approximately 14 billion light years away. Hence, the Universe is 14 billion years old. We also know that the Universe is expanding.
Question? Expanding into what?
We know the boundary of the Universe is approximately 14 billion light years away. Hence, the Universe is 14 billion years old. We also know that the Universe is expanding.
Question? Expanding into what?
