A vibrant cosmic scene with a swirling orange and blue galaxy, glowing center, and a dark purple planet casting a purple light.

The fundamental laws of thermodynamics govern the flow of energy through the universe. Among these is the second law of thermodynamics, stating that in any process involving the usage of energy, the availability of remaining energy decreases, not because the total energy decreases, as energy cannot be created or destroyed, but because as high-level energy sources are used, such energy changes form and becomes dispersed, essentially wasted. In an isolated system where no energy enters or leaves, the energy can only decrease in such a way, and therefore the entropy of the system can only increase, as energy becomes spread out and unusable. Essentially, in an isolated system, endless growth is unsustainable. Ver más