
Concept explainers
The process that changes protostar to a full-fledged star.

Answer to Problem 10RQ
The thermonuclear explosion causes a star to born from a protostar.
Explanation of Solution
The nebula contracts gravitationally, and it spins more rapidly, flattens and hats up at its centre. Then, a protostar is born from the hot central bulge. The thermonuclear explosion causes a star to born from a protostar.
In a thermonuclear explosion, the temperature exceeds 100 million. This temperature is needed for hydrogen fusion to take place effectively.
The time from a protostar to star is not same for all the stars but depends on the mass of the star. The more massive a star, the more rapid the process will be. Collapsing into a star-like Sun takes 50 million years. The collapsing of a protostar which has high mass might take only a million years whereas, smaller stars can take more than a hundred million years.
Conclusion:
Therefore, the thermonuclear explosion causes a star to born from a protostar.
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