Japanese physicists may have solved a longstanding mystery in cosmology -- how the large-scale magnetic fields found in today's galaxies and galaxy clusters were initially created. Kiyotomo Ichiki at the National Astronomical Observatory of Japan and colleagues suggest that these fields originated in the very early universe from interactions between photons and electrons before the first atoms had time to form. The fields produced may have been strong enough to affect the formation of early stars, says the team (Sciencexpress 1120690).
Scientists are still unsure about where the substantial magnetic fields in the present-day universe came from.
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