Radiation is the continual emission of infrared waves from the surface of all bodies, transmitted without the aid of a medium. Radiation does not need a medium for energy transfer, therefore, radiation can take place in a vacuum. Thermal energy from the sun reach the earth by the process of radiation. The sun emits electromagnetive waves. The group of electromagnetive waves that makes us feel warm is called infrared waves. While the thermal energy from the infrared waves is called radiant heat.
Thermal radiation also refers to electromagnetic radiation emitted from the surface of an object due to the object's temperature. This shows that all objects will emit some radiant heat, depending on its temperature. The hotter the objects, the greater radiant heat it emitted.
Thermal radiation is generated when heat from the movement of charged particles within atoms is converted to electromagnetic radiation.
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