The event that changes a protostar to a full-fledged star is
A)gravitational collapse.
B)gravitational expansion.
C)thermonuclear fusion.
D)the emission of light.
E)a catastrophic increase in temperature.

Question

Quizplus · Accepted Answer

The event that changes a protostar to a full-fledged star is thermonuclear fusion. This is the process where the temperature and pressure in the core of a protostar reach a point where hydrogen atoms can fuse together to form helium, releasing a huge amount of energy in the process. This energy production stabilizes the star and allows it to shine steadily for millions or billions of years.

The Event That Changes a Protostar to a Full-Fledged Star