Chandra X-Ray Observatory used to spot black hole spinning slower than its peers - News9 LIVE

The black hole designated as H1821+643 is the most massive black hole with an accurate spin...

Astronomers have measured the spin of H1821+643, a black hole at a distance of 3.4 billion light-years from the Earth, in the northern constellation of Draco. This is a record breaking measurement of… [+3192 chars]

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