What is the dynamic standoff allowing stars to exist across eons called?

Answer

Hydrostatic equilibrium

Hydrostatic equilibrium describes the essential, delicate, dynamic standoff required for a star to maintain a stable size and structure over vast stretches of time. This condition is defined by the perfect balance between the inherent, crushing inward pull exerted by the star's entire mass—gravity—and the immense outward push generated from within the core by thermal and radiation pressure. When this balance is perfectly maintained, the star neither collapses nor expands uncontrollably. If the balance is slightly upset, the self-regulating feedback mechanisms inherent to stellar physics immediately work to restore this precise equilibrium, governing the star's stability on the main sequence.

What is the dynamic standoff allowing stars to exist across eons called?

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The Forces in a Star's Main Sequence Stage - YouTube

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