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We actually don’t know how fast the Milky Way’s supermassive black hole is spinning but there might be a way to find out – Universe Today

The stars at the center of our galaxy could tell us just how fast our closest supermassive black hole is spinning.

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Unless Einstein is wrong, a black hole is defined by three properties: mass, spin, and electric charge. The charge of a black hole should be nearly zero since the matter captured by a black hole is electrically neutral. The mass of a black hole determines the size of its event horizon, and can be measured in several ways, from the brightness of the material around it to the orbital motion of nearby stars. The spin of a black hole is much more difficult to study.
How x-rays from a black hole tel…

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