Since the sun won't be extinct for another 4 billion years or so, it would have to be considered a moot question.
The primary source of the suns energy is nuclear fusion of hydrogen. Nuclear fusion occurs in the core of the Earth.
Nuclear fusion of hydrogen into helium.
Hydrogen and Helium
well pluto is so far away that the sun rays can't reach out that far for it to be warmer and for earth,the earth is much closer and could get most of the suns hot rays
It is fusion of hydrogen to form helium
the greenhouse effect
The moon is not a source of light because it simply reflects the suns light, therefore it is not a direct source of light
Suns rays are more vertical, hence stronger in their effect.
gases in the atmosphere trap the suns warmth
Chemical energy
It causes not all the light to get through
Nuclear fusion. Mainly, hydrogen-1 is converted to helium-4.