New Simulation Reveals the Churning Interiors of Giant Stars - by briankoberlein
On a basic level, a star is pretty simple. Gravity squeezes the star trying to collapse it, which causes the inner core to get extremely hot and dense. This triggers nuclear fusion, and the heat and pressure from that pushes back against gravity. The two forces balance each other while a star is in its main sequence state. Easy peasy. But the details of how that works are extremely complex.
Although the internal pressure and gravitational weight of a star are generally in equilibrium, the flow of heat is not. All the heat and energy generated in a stellar core has to escape in time, and there are two general ways in which it happens. The first is through a radiative exchange. High-energy gamma rays scatter against nuclei in the core, gradually losing some energy as they migrate to the surface and escape.
France Dernières Nouvelles, France Actualités
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