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First black hole spotted in 1964 is much more massive than researchers expected

The Cygnus X-1 black hole may be the most massive stellar-mass black hole ever found, at 21 times our sun's mass.

from http://www.firstpost.com/tech/science/first-black-hole-spotted-in-1964-is-much-more-massive-than-researchers-expected-9331201.html

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