Uranus has been rolling through the solar system on its side for four and a half billion years, confidently labelled an ice giant since a single spacecraft spent six hours there in 1986 — and until very recently, nobody had particularly strong grounds to argue otherwise. Then 2025 happened.

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The James Webb Space Telescope found a moon that the original mission missed entirely, sitting quietly in the inner system at roughly ten kilometres across, invisible to everything previously aimed at it. And two astrophysicists in Zürich published a paper suggesting that beneath that hydrogen-helium atmosphere, Uranus may be predominantly rock rather than ice — making the classification we've built forty years of textbook confidence around a historical artefact rather than a robust physical fact. In this episode, we explore what we actually know about the seventh planet, how planetary interiors are modelled when you cannot visit them, why the magnetic field has always been quietly awkward, and what it means for thousands of exoplanets across the galaxy if our local reference point turns out to have been the wrong kind of world all along.

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The narrator, David, is a professional voice actor who has digitized his voice using ElevenLabs’ voice-cloning technology and is fairly compensated for his vocal performance. Thumbnails are created using OpenArt, and music and sound effects come from Pixabay.

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