What two primary forces maintain a star in hydrostatic equilibrium?

Answer

Inward pull of gravity and outward push of thermal pressure

A stable, self-gravitating sphere of plasma exists in hydrostatic equilibrium, meaning the immense inward crush of gravity is perfectly balanced by the outward thermal pressure generated internally by nuclear fusion.

What two primary forces maintain a star in hydrostatic equilibrium?
astronomystarplasmacelestial body