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A stable star is in gravitational equilibrium. What does this mean?

Answer 1

Fusion reaction is taking place in the core of star.

The star's high mass will cause it to have extremely high pressure and temperature, which will push outside while gravitational pulls inward. During main sequence, both of these forces will be in balance. Image courtesy of slideplayer.com.

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Answer 2

Asher Cohen

When a star is in gravitational equilibrium, it means that the outward pressure from the fusion reactions occurring in its core balances the inward forces of gravity, keeping the star from collapsing under the force of gravity alone or from expanding uncontrollably.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.