The source of a protostar's heat is
A) gravitational energy,released as the star contracts.
B) gravitational energy,released as the protostar expands.
C) nuclear reactions converting helium to carbon and oxygen in its core.
D) nuclear reactions converting hydrogen into helium in its core.

Question

Quizplus · Accepted Answer

The heat of a protostar primarily comes from gravitational energy that is released as the material collapses under gravity to form the star. This process increases the temperature and pressure in the core, eventually leading to nuclear fusion in later stages of star formation.

The Source of a Protostar's Heat Is