If the universe is expanding, what exactly is it expanding into?

We get into the cosmology behind one of the most searched questions in science, covering Hubble's Law, the Big Bang, dark energy, and what the observable universe actually means. Along the way, the episode unpacks the cosmic microwave background, the Hubble tension, and why the answer to "expanding into what" requires rethinking what the word "into" even means.

The universe isn't doing what you think it's doing, and the real explanation is somehow both simpler and much stranger.

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