What temperature range defines the hottest sustained thermonuclear centers of stable, hydrogen-fusing celestial objects?
Answer
30 to 40 million Kelvin
When restricting the definition to the hottest, sustained, self-regulating energy-generating centers found within naturally occurring, stable stars that are currently fusing hydrogen, the scientific consensus points towards the cores of the most massive candidates, specifically O-type or Wolf-Rayet precursors. Models predict that the central temperatures within these giants can reach or exceed $30$ million Kelvin, potentially peaking around $40$ million Kelvin. This range represents the highest sustained thermonuclear heat achievable within a single stellar object during the current epoch of the universe.
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WR102. A star that is 200,000 degrees hotter than the Sun. - YouTube
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