What core temperature might a star twenty-five times the mass of the Sun approach?

$30$ million K ($3 imes 10^7 ext{ K}$)

Stars significantly more massive than the Sun exhibit core temperatures far exceeding $15$ million K because they must overcome a much stronger gravitational compression. Specifically, for a star possessing twenty-five times the mass of the Sun ($25 ext{ M}_ ext{sun}$), the internal furnace must reach temperatures around $30$ million K, represented as $3 imes 10^7 ext{ K}$. This elevated temperature is essential for maintaining hydrostatic equilibrium against the vastly increased inward gravitational pressure exerted by that substantial mass. This illustrates the aggressive, non-linear relationship where small increases in mass lead to sharp rises in the required core thermal resistance.