Physics energy are no longer valid. The two chief theories of modern physics present a different picture of the concepts of space, time, and matter from that presented by classical physics. Classical mechanics approximates nature as continuous, while quantum theory is concerned with the discrete nature of many phenomena at the atomic and subatomic level and with the complementary aspects of particles and waves in the description of such phenomena. The theory of relativity is concerned with the description of phenomena that take place in a frame of reference that is in motion with respect to an observer; the special theory
Branches of physics This theory is currently under developmental stage. Optics is the study of light, and the instruments created to use or detect it (i.e. telescopes, spectrometers, etc.). Atomic physics, molecular physics, and optical physics are each individual sub-fields of AMO that study the physical properties of the atom, molecules, and light, respectively. The study of the physical properties of matter in a condensed phase. Particle physics studies the nature of particles, while nuclear physics studies the atomic nuclei. Cosmology studies how the universe came to be, and its eventual fate. It is studied by physicists and astrophysicists. To the interdisciplinary fields,