What two colossal forces are in a constant tug-of-war during hydrostatic equilibrium?

Answer

Gravity and thermonuclear fusion

Hydrostatic equilibrium is maintained by the inward crush of gravity, which is fueled by the star's mass, being perfectly balanced by the immense outward push generated by thermonuclear fusion occurring in the core.

What two colossal forces are in a constant tug-of-war during hydrostatic equilibrium?

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