Light
Mass-energy equivalence is the concept that mass and energy are interchangeable, as described by Einstein's famous equation E=mc². It states that a small amount of mass can be converted into a large amount of energy, and vice versa.
The process in which two atomic nuclei combine to form a heavier nucleus, releasing an enormous amount of energy.
The splitting of an atomic nucleus into two smaller nuclei, accompanied by the release of a significant amount of energy.
The principle stating that energy cannot be created or destroyed but only transferred or transformed from one form to another.