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In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability...

A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') is an optical phenomenon produced by light (typically from the Sun or Moon) interacting...

In astrodynamics or celestial mechanics a parabolic trajectory is a Kepler orbit with the eccentricity equal to 1 and is an unbound orbit that is exactly...

A point source is a single identifiable localised source of something. A point source has negligible extent, distinguishing it from other source geometries...

In theoretical physics, a quiver diagram is a graph representing the matter content of a gauge theory that describes D-branes on orbifolds. Quiver diagrams...

The Bragg peak is a pronounced peak on the Bragg curve which plots the energy loss of ionizing radiation during its travel through matter. For protons...

A jet is a stream of fluid that is projected into a surrounding medium, usually from some kind of a nozzle, aperture or orifice. Jets can travel long distances[quantify]...

The following is a chronology of discoveries concerning the magnetosphere. 1600 - William Gilbert in London suggests the Earth is a giant magnet. 1741...

For many paramagnetic materials, the magnetization of the material is directly proportional to an applied magnetic field, for sufficiently high temperatures...

Neutron star spin up is the name given to the increase in rotational speed over time first noted in Cen X-3 and Her X-1 but now observed in other X-ray...

Bengt Georg Daniel Strömgren (21 January 1908 – 4 July 1987) was a Danish astronomer and astrophysicist. Bengt Strömgren was born in Gothenburg. His parents...

In quantum field theory, Seiberg duality, conjectured by Nathan Seiberg in 1994, is an S-duality relating two different supersymmetric QCDs. The two theories...

Thermofluids is a branch of science and engineering encompassing four intersecting fields: Heat transfer Thermodynamics Fluid mechanics Combustion The...

This is a list of scientific units named after people. For other lists of eponyms (names derived from people) see eponym. Note that by convention, the...

David Henry Frisch (March 12, 1918 – May 23, 1991) was an American physicist who helped develop the atom bomb in World War II and later became active in...

An acoustic waveguide is a physical structure for guiding sound waves, i.e., a waveguide used in acoustics. One example is a speaking tube used aboard...

ASPERA (or AStroParticle European Research Area) is a network of national government agencies responsible for coordinating and funding national research...

Marcello Stefano Pirani (July 1, 1880 – January 11, 1968) was an Italian physicist known for his invention of the Pirani vacuum gauge, a vacuum gauge based...

In electronics, cryoelectronics or cryolectronics is the study of superconductivity under cryogenic conditions and its applications. It is also described...