A very important consequence of relativity is the relation between mass and energy.

Summary

This quote highlights a fundamental concept in the theory of relativity, which is the profound connection between mass and energy. According to relativity, mass and energy are not independent entities but are essentially interchangeable. This concept is captured in the famous equation E=mc², where E represents energy, m denotes mass, and c represents the speed of light. It suggests that even stationary objects possess energy (as represented by their mass), and that energy can be converted into mass and vice versa. This realization has significant implications in various scientific fields, including nuclear reactions and the understanding of the universe on a cosmic scale.