The Universe is customarily defined as everything that exists, everything that has existed, and everything that will exist.[19][20][21] According to our current understanding, the Universe consists of three constituents: spacetime, forms of energy (including electromagnetic radiation and matter), and the physical laws that relate them. The Universe also encompasses all of life, all of history, and some philosophers and scientists even suggest that it encompasses ideas such as mathematics and logic.[22][23][24]

Etymology

The word universe derives from the Old French word univers, which in turn derives from the Latin word universum.[25] The Latin word was used by Cicero and later Latin authors in many of the same senses as the modern English word is used.[26]