B Why do stars experience gravity more than its mass?

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Stars experience gravity more than their mass due to the balance between gravitational forces and internal pressure from nuclear fusion. When a star exhausts its fusion fuel, the outward pressure decreases, allowing gravity to dominate and potentially leading to implosion. The sun, for instance, currently does not implode because its fusion reactions generate enough energy to counteract gravitational collapse. Not all stars will become black holes; only those that reach a critical density and mass can collapse into one. The process of forming a black hole is complex and involves the interplay of mass, density, and the forces at work within the star.
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Evidence-based theory is ok. Theory based 'observations' are no good to a Scientist.
 

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