Transcript: The second law of thermodynamics states that as energy changes form the amount of heat energy will tend to increase. Another way of saying this is that the entropy or disorder of a system will tend to increase. We are familiar with this systematic change from order to disordered energy with the simple example of an automobile. Gasoline is a place where the ordered energy in chemical bonds in hydrocarbons are converted into ordered mechanical energy in the motion of an engine. But the ultimate result is the release of heat or disordered energy, and that’s the inefficiency in a car. Stars are also creating disorder from order. They are fusing atomic nuclei to make heavier and heavier forms, but they’re releasing the energy as disordered radiant heat energy into space.