polarization of light

The black hole of our Milky Way as seen in polarized light. Astronomers have for the first time been able to measure polarity, a hallmark of magnetic fields, so close to the rim of Sagittarius A*. The lines added to the image indicate the direction of polarization, which is related to the magnetic field around the shadow of the black hole. Credit: EHT Collaboration

Strong magnetic fields surround the Milky Way's central black hole

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