প্র‍থম আবিষ্কৃত কৃষ্ণ গহ্বরের নাম কী?

Scientists think stellar-mass black holes, which contain up to a few times the sun's mass, form when giant stars die and collapse in on themselves.
- The first black hole ever discovered was Cygnus X-1, located within the Milky Way in the constellation of Cygnus, the Swan.
- Astronomers saw the first signs of the black hole in 1964 via gas it sucked away from a closely orbiting blue supergiant star.
- As this gas spiraled into the black hole, it became so hot it emitted high-energy X-rays and gamma-rays that satellites could detect.
- A trio of studies in 2011 suggested Cygnus X-1 was located about 6,070 light-years from Earth, but the new research suggests the black hole is actually about 7,240 light-years away.

সূত্র: Encyclopedia Britannica