>>14114174>sun is hot because of nuclear fusionthen why is the surface of the sun cooler than the atmosphere of the sun?
>The third layer of the sun's atmosphere is the corona. Like the chromosphere, the sun's corona can only be seen during a total solar eclipse (or with NASA's Solar Dynamics Observatory). It appears as white streamers or plumes of ionized gas that flow outward into space. Temperatures in the sun's corona can get as high as 3.5 million degrees F (2 million degrees C. As the gases cool, they become the solar wind.>Why the corona is up to 300 times hotter than the photosphere, despite being farther from the solar core, has remained a long-term mystery. 