Magnetic fields
This animation shows a spinning black hole drawing in a disc of gas that has probably been captured from a close-by companion star. As the gas falls towards the black hole it heats up, reaching millions of degrees before plunging into the black hole. When gas is this hot, it glows in X-ray light, and can be seen by an X-ray space telescope such as Chandra or XMM-Newton. This hostile environment produces intense magnetic fields, which can be seen looping between the poles of the black hole.
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