text: The surface of the sun (that which is visible to the naked eye) is roughly 10,000 degrees Fahrenheit, while the corona has temperatures in the millions of degrees, as does the interior.  \n\nEventually, a star of the sun's mass will become a red giant, where it will become cooler (but still plenty hot enough to eventually incinerate at least half of the inner planets of the solar system) and much larger.  Then once it has spent its fuel it will collapse into a white dwarf.  At this stage it will still be giving off heat and radiation, but no where near the level it does now.