How Does Fusion Turn Hydrogen into Helium and Release Energy?

Why does a tiny mass difference become a long-lasting stellar power source?

Connect nuclei, temperature, tunnelling, mass difference, and released energy without skipping the physical steps.

A scientific artistic cutaway of a Sun-like star with a brilliant fusion core and layered stellar interior. — Vastward scientific reconstruction. The web diagram below explains the reaction sequence; the hero image establishes the hot, dense stellar-core setting.

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