An ingenious use of gravitational lensing allows the measurement of magnetic fields in a galaxy five billion years ago.
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Lilly, S.J. Magnetic fields under the lens. Nat Astron 1, 565–566 (2017). https://doi.org/10.1038/s41550-017-0230-1
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DOI: https://doi.org/10.1038/s41550-017-0230-1
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