The two characteristics of a star to become a black hole are:
- Its mass is greater than 20 times the mass of the Sun.
The correct options are C and D.
When a star has consumed all its fuel (like hydrogen), that is to say, when it is at the end of its life, it can become a black hole. For this to happen, the mass of the star must be greater than 20 times the mass of the Sun. If a star is at the end of its life cycle but has a mass that is less than 20 times the Sun's mass, it will not become a black hole.
The given options:
A. Its mass is equal to that of the sun. False
Its mass must be greater than 20 times the mass of the Sun.
B. It has an abundant supply of hydrogen. False
When it has an abundant supply of hydrogen, the star is at the beginning or the middle of its life cycle, and to become into a black hole it must be at the end of it.
C. Its mass is greater than 20 times the mass of the Sun. True
Yes, its mass must be greater than 20 times the mass of the Sun.
D. It is dying. True
The star must have no more fuel to continue its life cycle.
Therefore, options C and D are correct.
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