Together with the theory of relativity, quantum mechanics comprises an extremely important approach to understanding the universe. All matter is composed of atoms. However, it is postulated that there exist even smaller, subatomic particles which make up atoms. Observation of the behavior of these atoms reveals a number of strange phenomena. Furthermore, existence depends on observation.
Electrons move around the nucleus of an atom.
In other words, location and quantity of motion cannot be measured simultaneously. Measurement of this area of uncertainty was expressed in terms of theorem by the German Werner Heisenberg, et. When moving back in time to examine the beginning of the universe, inevitably one bumps up against the mystery of the formation and behavior of matter at the fundamental particle level. This implies questions such as where did the energy for electrons, photons and quarks come from, and what occurred under conditions of infinite temperature and density. Thus, the study of quantum mechanics is the same as exploring the very limits of the universe.