Cosmic Spin: Could a Rotating Universe Solve the Hubble Tension?

In this Science Corner episode on the Deep Dive, we explore a bold idea: might the universe itself be rotating? We examine the Hubble tension—the mismatch between early- and late-universe measures of the expansion rate—and how a small global rotation, or related ideas like a self-similar dark fluid, could alter cosmic history. We trace concepts from Gödel to the possibility of our universe inside a Kerr black hole, and discuss what such models would need to match CMB observations, large-scale structure, and nucleosynthesis before we can seriously embrace them.

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