What energy transport mechanism takes over in the outer, cooler, and less dense layers of a star?

Answer

Convection, similar to boiling water.

In the outer layers, where the gas is cooler, energy transport occurs via convection, where hot gas rises, cools near the surface, and then sinks back down to be reheated.

What energy transport mechanism takes over in the outer, cooler, and less dense layers of a star?
astronomyenergystarsradiationFusion