What happens when the collapsing core reaches a density high enough (around $10^{-13} ext{ g/cm}^3$) to form the first hydrostatic core?
Answer
The core becomes opaque to its own radiation, trapping heat temporarily
The formation of the first hydrostatic core is characterized by the density becoming so high that radiation cannot easily escape, trapping heat and significantly raising the internal temperature until molecular dissociation occurs later.
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