Multiple Choice
In a binary star system,one component is found to have about 3 solar masses,the other about 7 solar masses.The 3-solar-mass star is visible from Earth,but the 7-solar-mass star is not.Theoretical considerations tell us that the 7-solar-mass star must be a:
A) neutron star.
B) cool planetary object.
C) white dwarf.
D) black hole.
Correct Answer:

Verified
Correct Answer:
Verified
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