Nuclear fusion in the Sun is sustained by extreme gravity despite the energy released. The stability is maintained through controlled fusion reactions.
Nuclear fusion in the Sun is a complex process where extremely high temperatures and pressures are required to overcome the electrical repulsion between nuclei and initiate fusion reactions. The Sun's core conditions of about 15 million °C and high pressure allow for fusion reactions to occur.
Despite the energy equivalent to ten billion hydrogen bombs going off every second due to fusion, the Sun doesn't blow apart because of its extreme gravity. This gravity, about 333,000 times that of Earth, counteracts the outward force of the energy released, maintaining the Sun's stability.
In contrast to uncontrolled thermonuclear reactions in hydrogen bombs, the Sun's fusion reactions proceed in a controlled manner due to the balanced interplay between gravity, energy release, and fusion processes within its core.
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