What Is Cygnus X-1

question 49

Multiple Choice

What is Cygnus X-1?

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

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