Which of the following forces opposes gravity, keeping main sequence stars in equilibrium?
Question
Which of the following forces opposes gravity, keeping main sequence stars in equilibrium?
Solution
The force that opposes gravity and keeps main sequence stars in equilibrium is the pressure from nuclear fusion, specifically the fusion of hydrogen into helium in the star's core. This process releases a tremendous amount of energy in the form of light and heat, creating an outward pressure. This outward pressure balances the inward pull of gravity, preventing the star from collapsing under its own weight and thus maintaining its equilibrium. This state of balance is known as hydrostatic equilibrium.
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