a. a protostar reaches a temperature high enough for nuclear fusion to begin.
b. a red giant collapses on itself and becomes a black hole.
c. pressure within a protostar becomes so great that a supernova occurs.
d. increasing heat within a supergiant causes gravity to be greater than pressure.
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Home » Geography » A star is thought to be born when a. a protostar reaches a temperature high enough for nuclear fusion to begin. b. a red giant collapses on itself and becomes a black hole. c. pressure within a protostar becomes so great that a supernova occurs. d.