The x-ray source Cygnus X-1 is a black hole candidate located in a binary star system. The x-ray source is believed to occupy a volume smaller than Earth. This size is deduced from:
A) its luminosity and spectral class.
B) the shortness of its orbital period.
C) the short time period of the rapid flickering in its x-ray brightness.
D) its distance from Earth and the angle it subtends in the sky.
Correct Answer:
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