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How young galaxies grew magnetic fields faster than expected

How young galaxies grew magnetic fields faster than expected
Lower panel shows a collapsing plasma cloud with uniform magnetic field (red). Top Right: Compression alone amplifies the field. Bottom Right: Collapse-driven turbulence accelerates dynamo amplification (also generating a horizontal component (blue)), producing magnetic fields stronger than compression alone. Credit: Pallavi Bhat, Anvar Shukurov, Muhammed Irshad and Kandaswamy Subramanian. NASA; SOFIA; HAWC+; A. S. Borlaff/NASA; JPL-Caltech; ESA; Hubble.

How fast can a galaxy build ordered magnetic fields spanning thousands of light-years? Existing theories say several billion years, but observations of galaxies in our universe imply shorter timescales...

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