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figures/eventail.gif
Structure of 3 models of stars : A star like the Sun at the center, a star a bit less massive below, and a very old star. The wavy arrows indicate the calm regions, while the whirls illustrate the presence of powerful convective movements.
Crédit : Paris Observatory / UFE

The stars lose a considerable amount of energy, through the radiation emitted (4*1026 watts for the Sun, that is the production of 400 000 000 billion nuclear power stations of 1GW, and up to one million times this value for the more luminous stars).

The structure of the star adjusts itself to set up an equilibrium between this energy lost at the surface and the energy produced in the core via nuclear fusion reactions.

This structure is highly varied. It depends on the age, the mass, and the composition of the star.