How was the black hol discovered?

Answer 1

Scientists saw stars orbiting and disappearing into nothing, so they named it a black hole.

Answer 2

The concept of black holes was first proposed by physicist John Michell in 1783, but the actual discovery of a black hole took several decades. In the 20th century, scientists like Karl Schwarzschild and Subrahmanyan Chandrasekhar made significant advances in understanding the theoretical aspects of black holes. However, the first observational evidence for a black hole came in 1971 with the discovery of a strong radio source known as Cygnus X-1. Further observations and studies confirmed that Cygnus X-1 was a binary system consisting of a black hole and a companion star.