Most binary systems with an invisible companion contain a large, bright star and a small, dim star hidden by the light of its larger companion. however, in some binary systems, the unseen companion may be a black hole instead of a small star. one of the most likely black hole candidates in a binary system is an object called cygnus x-1. if you were an astronomer trying to prove that cygnus x-1 is a black hole, which of the following observations would provide evidence in support of your claim? check all that apply
a. cygnus x-1 has a mass one-tenth that of the sun.
b. cygnus x-1 produces a large amount of x-ray emissions.
c. cygnus x-1 produces no x-ray emissions.
d. cygnus x-1 has a diameter less than 300 kilometers.
e. cygnus x-1 has a mass of 10 solar masses.
f. cygnus x-1 has a diameter much greater than 300 kilometers.