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The centre of the sun is about 15,700,000 kelvins (at that heat and inaccuracy, similar to Celsius) according to our best models, although we could never really know. The photosphere (the visible outer shell of the sun) is about 5,780 kelvins (about 5,510 celsius). 

Curiously, the bit just outside what we would consider the 'surface' (corona) of the sun is actually hotter than the 'surface' itself. The corona of the sun is about 5,000,000 kelvins.

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