What force perfectly counteracts gravity during a star's stable main sequence phase?
Answer
Outward thermal pressure generated by nuclear fusion
Throughout the long, stable existence of a star, often referred to as the main sequence phase, a delicate equilibrium must be maintained within its interior. This balance pits the immense, inescapable inward pull of the star's own mass, known as gravity, against the opposing force generated by energy production. This opposing force is the outward thermal pressure created as lighter elements, primarily hydrogen, are fused into heavier ones in the core, releasing vast amounts of energy. This continuous energy output provides the necessary support to keep the star inflated and prevent immediate gravitational collapse.
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