How does the gravitational paradox describe the structure of a star during its red giant phase?
Answer
The core contracts while the outer envelope expands
The structure of a star enters a decoupled state during the red giant phase. The core, deprived of hydrogen fusion, is governed by the dominance of gravity, causing it to condense into a smaller, denser, and hotter state. Simultaneously, the outer envelope is driven outward by the intense radiation pressure generated by shell burning. This simultaneous shrinking of the core and swelling of the envelope creates an appearance of paradoxical physical behavior, where the two primary components of the star evolve in opposite directions.
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