The source of energy for a contracting protostar comes from

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The source of energy for a contracting protostar comes from gravitational potential energy. As the protostar contracts due to gravity, its potential energy gets converted into thermal energy, which causes the temperature and pressure in the core to increase. This eventually leads to fusion reactions and the formation of a stable star. Kinetic energy is not a significant source of energy during this process, and thermonuclear and radiation energy only become important after fusion has started.

The Source of Energy for a Contracting Protostar Comes from