Cygnus X-1 is widely recognized as the leading candidate for an observable black hole binary system. It was one of the first sources widely accepted to be a black hole, discovered due to its strong X-ray emissions and the dynamic behavior observed in its binary system, which includes a massive blue supergiant star.

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What Is Cygnus X- 1

Question 76

Multiple Choice

What is Cygnus X- 1?

A) the first gamma- ray burster to be spotted in other wavelengths as well
B) the strongest X- ray eclipsing binary system in the sky
C) a millisecond pulsar with three Earth- like planets around it
D) the brightest star in the constellation Cygnus
E) the leading candidate for an observable black hole binary system

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