All matter above absolute zero continuously emits electromagnetic radiation. The quantity of energy radiated by a body (also referred to as "radiant power") is proportional to the fourth power of the temperature of the body according to the Stefan-Boltzman Law.
The radiant power of an object is primarily a function of the surface temperature of the object. Small temperature increases result in large energy increases.
In simple terms, the Stefan-Boltzman law can be expressed as follows: hot bodies generate more radiation than cooler bodies.
