How does gravity assist in maintaining the fusion reaction in a star, a feature missing in terrestrial fusion experiments?

If fusion falters, gravity squeezes the core tighter, raising the temperature back to the necessary ignition point.

The star possesses an inherent, automatic regulatory mechanism due to its immense gravity that terrestrial fusion reactors lack. In a star, the outward pressure generated by fusion is in constant competition with the inward crush of gravity, maintaining hydrostatic equilibrium. If, for some reason, the fusion rate momentarily slows down or falters, the outward pressure decreases slightly. Gravity immediately takes advantage of this momentary imbalance by causing the core to contract slightly. This contraction compresses the plasma, causing the core temperature to rise rapidly, which in turn reignites the fusion process back to its necessary self-sustaining level. In contrast, if containment fails in a terrestrial experiment, the reaction simply stops, which is considered a safety feature, but necessitates a massive, continuous external energy input to restart.