Scientists revisit the 1st black hole they ever discovered and realize it's bigger than they thought

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New evidence suggests the first known black hole is bigger than previously thought, which may force scientists to reconsider their understanding of how giant stars give rise to black holes.

Scientists revisit the 1st black hole they ever discovered and realize it's bigger than they thought : Read more

 

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My observation. The 60 solar mass star that created the black hole according to stellar evolution, has a very short lifetime, perhaps 5 million years or less so Cygnus X-1 is a very young black hole too. The phys.org report makes this clear, "The black hole in the Cygnus X-1 system began life as a star approximately 60 times the mass of the Sun and collapsed tens of thousands of years ago," he said.", https://phys.org/news/2021-02-black-hole-massive-thought.html

Compared to ages for primordial black holes or SMBH, Cygnus X-1 black hole is very young

The link at phys.org has 'Cygnus X-1 contains a 21–solar mass black hole—Implications for massive star winds', https://science.sciencemag.org/content/early/2021/02/17/science.abb3363, 18-Feb-2021. My observation. As space.com reported, the parallax method used to determine distance and size for the new metrics. A 21.2 solar mass black hole, Schwarzschild radius = 6.2609E+01 km or close to 63 km.