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A comment on Giant magnetic ropes seen in Whale Galaxy's halo. Parent comment

Re:Giant magnetic ropes seen in Whale Galaxy's halo by gattr on Thursday January 02, 2020 @10:12AM (#21935950)
By measuring polarization of the received radio-frequency signals. The polarization is affected by magnetic fields ("Faraday rotation", see [0, 1]).

[0] https://en.wikipedia.org/wiki/Faraday_effect#In_the_interste...

[1] https://www.mpifr-bonn.mpg.de/research/fundamental/cosmag

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