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The innermost layer of the sun is the core. With a density of 160 g/cm^3, 10 times that of lead, the core might be expected to be solid. However, the core's temperature of 15 million kelvins (27 million degrees Fahrenheit) keeps it in a gaseous state Whereas the surface can vary from 5500ºC to 6000ºC for all the layers check the related link
The temperature of the solar corona ranges from 1 to 3 million degrees Celsius. This is significantly hotter than the Sun's surface temperature, which is around 5,500 degrees Celsius. The exact mechanism behind this temperature difference is still not fully understood.
Rigel's effective temperature is 12100 K. 8 million Rigels would not be 8 million times at hot. In fact, in all likelihood the super-Rigel could well have become a super-massive black hole and be incapable of radiating at any temperature..
The core temperature of the Sun is estimated to be around 15 million degrees Celsius.
Center core.