* Nuclear fusion happens in the core: The sun's energy is generated deep within its core, where immense pressure and temperature allow hydrogen atoms to fuse into helium. This fusion process releases enormous amounts of energy in the form of light and heat.
* The corona is much hotter: The corona is the outermost layer of the sun's atmosphere, and it's incredibly hot (millions of degrees Celsius). This heat is caused by various processes, including magnetic energy release and waves generated within the sun. However, the corona doesn't produce the light we see.
* The photosphere is where light is emitted: The visible light we see from the sun originates from the photosphere, a layer just below the corona. This layer is much cooler than the corona, around 5,500° Celsius, and it's where the light we perceive is generated.
In summary: The sun's glow is primarily due to the nuclear fusion reactions in its core, which produce light and heat. The corona is extremely hot but does not contribute significantly to the sun's visible glow.
