A planetary nebula is an example of a star no longer in hydrostatic equilibrium.

Question

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A planetary nebula is formed when a low to medium mass star reaches the end of its life and enters into the red giant phase. During this phase, the outer layers of the star expand and get ejected, forming a planetary nebula. The star is no longer in hydrostatic equilibrium because the release of energy from nuclear fusion in the core is no longer sufficient to balance the inward pull of gravity.

A Planetary Nebula Is an Example of a Star No