New observations of the first black hole ever detected have led astronomers to question what they know about the Universe's most mysterious objects. Published today in the journal Science, the research shows the system known as Cygnus X-1 contains the most massive stellar-mass black hole ever detected without the use of gravitational waves.
https://phys.org/news/2021-02-black-hole-massive-thought.html

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With a mass originally estimated at 15 times that of the sun, Cygnus X-1 is one of the most massive and most luminous of the X-ray binary systems known in the Milky Way. New measurements have now raised that figure to 21 solar masses. The makeover does not change the overall perception of the cosmos; Cygnus X-1 is still a black hole, an almost science-fictional manifestation of Einsteinian weirdness in celestial reality. But the details of how Cygnus X-1 became a black hole are now in doubt.

“A significant change in the mass of such a classic and historical astronomical source is a big deal (at least to astronomers),” Daniel Holz, a theoretical astrophysicist at the University of Chicago who was not part of the study, wrote in an email. Also by email, James Miller-Jones of the International Center for Radio Astronomy Research at Curtin University in Australia wrote: “We realized that a 21-solar-mass black hole was too massive to form in the Milky Way with the best existing estimates of the amount of mass lost by massive stars in stellar winds.”
https://www.nytimes.com/2021/02/18/science/cygnus-black-hole-astronomy.html

New observations of the first black hole ever detected have led astronomers to question what they know about the Universe's most mysterious objects. Published today in the journal Science, the research shows the system known as Cygnus X-1 contains the most massive stellar-mass black hole ever detected without the use of gravitational waves.
https://phys.org/news/2021-02-black-hole-massive-thought.html

====================================================================

With a mass originally estimated at 15 times that of the sun, Cygnus X-1 is one of the most massive and most luminous of the X-ray binary systems known in the Milky Way. New measurements have now raised that figure to 21 solar masses. The makeover does not change the overall perception of the cosmos; Cygnus X-1 is still a black hole, an almost science-fictional manifestation of Einsteinian weirdness in celestial reality. But the details of how Cygnus X-1 became a black hole are now in doubt.

“A significant change in the mass of such a classic and historical astronomical source is a big deal (at least to astronomers),” Daniel Holz, a theoretical astrophysicist at the University of Chicago who was not part of the study, wrote in an email. Also by email, James Miller-Jones of the International Center for Radio Astronomy Research at Curtin University in Australia wrote: “We realized that a 21-solar-mass black hole was too massive to form in the Milky Way with the best existing estimates of the amount of mass lost by massive stars in stellar winds.”
https://www.nytimes.com/2021/02/18/science/cygnus-black-hole-astronomy.html

Uh oh someone has to go back to the drawing board as to how something that big can form where it is...maybe it was there before the MilkyWay Galaxy gathered around it? We know Galaxy's move thru Space maybe it's a meeting in the dark between us and it.