Beijing, China (SPX) Feb 19, 2021
Cygnus X-1, a binary star system first discovered in 1964, comprises one of the closest black holes to Earth. New observations of this black hole, the first ever detected, have led astronomers to question what they know about the Universe's most mysterious objects. An international team, including researchers from the National Astronomical Observatories of the Chinese Academy of Sciences (
First black hole ever detected is more massive than we thought
Space Daily
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