Nature, Published online: 28 January 2026; doi:10.1038/d41586-026-00026-9

Numerical simulations provide a mechanism that explains how celestial objects such as stars and galaxies can generate ordered, macroscopic magnetic fields. The mechanism arises from turbulence — chaotic changes in the pressure and velocity of fluid — and avoids a physical effect that hinders other proposed systems from explaining observed ordered fields.

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