When was the first black hole discovered?

1 Answer
Mar 23, 2016

The earliest known object widely considered to contain a black hole is Cygnus X-1, diacovered in 1964.


Cygnus X-1 is believed to have a black hole at its center because such a black hole would most naturally account for its obaerved X-ray emissions and its interaction with the gases from a companion star.

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