Clocks which are far from massive bodies (or at higher gravitational potentials) run faster, and clocks close to massive bodies (or at lower gravitational potentials) run slower. This is because gravi ...
In Newtonian gravity, a particle of mass M creates a gravitational field \vec{g}=\frac{-G M}{r^2}\hat{r}, where the radial unit vector \hat{r} points away from the particle. The gravitational force ex ...
Gravitation, or gravity, is a natural phenomenon by which all physical bodies attract each other. It is most commonly recognized and experienced as the agent that gives weight to physical objects and ...
The deflection of light by gravity is responsible for a new class of astronomical phenomena. If a massive object is situated between the astronomer and a distant target object with appropriate mass an ...
Soon after publishing the special theory of relativity in 1905, Einstein started thinking about how to incorporate gravity into his new relativistic framework. In 1907, beginning with a simple thought ...
Main article: History of special relativityLength contraction was postulated by George FitzGerald (1889) and Hendrik Antoon Lorentz (1892) to explain the negative outcome of the Michelson-Morley exper ...
Clocks on the Space Shuttle run slightly slower than reference clocks on Earth, while clocks on GPS and Galileo satellites run slightly faster. Such time dilation has been repeatedly demonstrated (see ...
A popular picture for understanding this idea is provided by a thought experiment consisting of one observer midway inside a speeding traincar and another observer standing on a platform as the train ...
The word vacuum comes from Latin, meaning "an empty space, void", noun use of neuter of vacuus, meaning "empty", related to vacare, meaning "be empty".Vacuum is one of the few words in the English lan ...
The speed of light in vacuum is usually denoted by c, for "constant" or the Latin celeritas (meaning "swiftness"). (Capital C is the SI unit for coulomb of electric charge.) Originally, the symbol V w ...
Postulates“ Reflections of this type made it clear to me as long ago as shortly after 1900, i.e., shortly after Planck's trailblazing work, that neither mechanics nor electrodynamics could (except in ...
The Elements are mainly a systematization of earlier knowledge of geometry. Its superiority over earlier treatments was rapidly recognized, with the result that there was little interest in preserving ...
The debate on linguistic conventionalism goes back to Plato's Cratylus and the Mīmā?sā philosophy of Kumārila Bha??a. It has been the standard position of modern linguistics since Ferdinand de ...
Many things depend on temperature, such asphysical properties of materials including the phase (solid, liquid, gaseous or plasma), density, solubility, vapor pressure, electrical conductivityrate and ...
The idea of a sphere-world was constructed by Henri Poincaré who, while pursuing his argument for conventionalism (see philosophy of space and time), offered a thought experiment about a sphere with ...
