Physics
The natural science studying matter, energy, motion, and forces — from subatomic particles to cosmic structures.
Physics is the study of the fundamental laws that govern the universe. Its seven branches span the full arc of the discipline: Classical Physics covers mechanics, thermodynamics, electromagnetism, optics, fluids, and acoustics; Modern & Quantum explores relativity and quantum mechanics; Subatomic delves into particle and nuclear physics; Atoms & Matter covers atomic, condensed matter, plasma, and soft matter physics; Astrophysical Sciences examines stars, cosmology, and planetary science; Applied & Computational provides the computational tools and mathematical methods; and Frontier Physics pushes the boundaries with quantum information and string theory. The branches are ordered so that each builds on the concepts before it.
Explore
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Classical Physics
The foundational branch of physics covering mechanics, thermodynamics, electromagnetism, optics, fluid dynamics, and wave phenomena.
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Modern & Quantum Physics
The revolutionary 20th-century theories of special and general relativity, quantum mechanics, and quantum field theory.
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Subatomic Physics
The study of particles and nuclei — from quarks and leptons in the Standard Model to nuclear structure and reactions.
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Atoms & Matter
The physics of atoms, molecules, condensed matter systems, plasmas, and soft biological materials.
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Astrophysical Sciences
The study of stars, galaxies, the cosmos, and planetary systems through the lens of fundamental physics.
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Applied & Computational Physics
Computational methods, nonlinear dynamics, and the mathematical techniques that power modern physics research.
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Frontier Physics
The cutting edge of theoretical and experimental physics — quantum information and the quest for quantum gravity.