Question: ( 1 pt ) : Even though masses of binary stars are fairly easy to calculate using Kepler's laws, the mass of the black hole

(1 pt): Even though masses of binary stars are fairly easy to calculate using Kepler's laws, the mass of the black hole candidate Cygnus X-1 was initially very uncertain because
telescopes at the time were not powerful enough to tell Cygnus x-1 and its companion star apart.
its distance from Earth was not well known.
it could not be detected using electromagnetic radiation.
Cygnus X-1 and its companion star were too close together.
( 1 pt ) : Even though masses of binary stars are

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