In a main-sequence star like the Sun, what is the primary outward pressure that counteracts gravity?

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Gas pressure

Gas pressure is generated by the intense heat of nuclear fusion in a star's core, which causes particles to move rapidly and push outward. This creates a state of hydrostatic equilibrium, where the outward gas pressure perfectly balances the inward pull of gravity. If this pressure were suddenly removed, the Sun's massive gravity would cause it to collapse completely in less than an hour.

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In a Sun-like main-sequence star, what primary form of pressure counteracts gravity?

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