Naturally, sunlight travels at the speed of light, whereas heat energy flows more slowly. Different atmospheric gases respond to radiation at different wavelengths in different ways.
Most of the sun's light is absorbed by the atmosphere. The Sun can't actually shine ON the air because it is usually quite clear. Yes, the Sun shines throug it. As a result, the majority of the Sun's heat energy reaches the surface instead of the air, warming the air as it reflects heat back up.Earth, however, is a planet and does not generate energy. However, at night, it emits a significant amount of energy in the form of terrestrial radiation (this energy is absorbed by earth during day time).
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