# Black hole of mammoth proportions spinning at speed of light!

Feb 28 2013, 17:48 IST
SummaryAstronomers, for the first time, have measured the spin rate of a super-massive black hole - and found it is rotating at nearly the speed of light.

each downswing, you go higher and higher as you add angular momentum.

Studying a supermassive black hole also allows theorists to test Einstein's theory of general relativity in extreme conditions.

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