Do thermonuclear reactions always take place in the center of a star?

In red giants and supergiants, thermonuclear reactions take place in a layered source gradually moving from the center to the surface. In the process of a supernova explosion, the shock wave for a short time heats the outer shell to such a high temperature that thermonuclear reactions also take place in it. Thermonuclear reactions can also occur in certain areas of a star’s surface if the temperature rises there to high values.

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