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If the Universe is expanding, what is it expanding into?

If the Universe is expanding, what is it expanding into?

Update: 2024-08-02

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Anne writes in with this question, which James Tytko took on with the help of the University of Cambridge's Public Astronomer, Matt Bothwell... Like this podcast? Please help us by supporting the Naked Scientists

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If the Universe is expanding, what is it expanding into?

If the Universe is expanding, what is it expanding into?

Dr Chris Smith