What two opposing forces must balance to maintain hydrostatic equilibrium in a star?
Answer
The inward force of gravity and the outward pressure from nuclear fusion
Hydrostatic equilibrium is the condition where a star exists in a stable state throughout its main sequence life. Gravity is a constant force attempting to compress the star inward, while the process of nuclear fusion in the star's core generates energy that exerts pressure outward. As long as these two forces remain equal and balanced, the star maintains a stable size and shape, preventing total collapse or uncontrolled expansion.
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