The first image of a black hole was of M87*, the supermassive monster at the center of the enormous elliptical galaxy M87. The image was only possible thanks to the Event Horizon Telescope, and follow-up observations have revealed more insight, including information about its magnetic field. Researchers have now seen that it is changing quite a lot. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Magnetic fields in space can be measured by studying the polarization of light, the way light oscillates in specific directions as it travels towards us. 3D film used glasses and polarized light to project two different images to our eyes. Similarly, a strong magnetic field can affect light, creating a polarization pattern that can be seen fr

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