You are here: Home
Personal tools

Did you not find what you were looking for? Try the Advanced Search to refine your search.

Search results 480 items matching your search terms

Subscribe to an always-updated feed of these search terms

Stefan-Boltzmann law
One of the laws governing the properties of the simplest form of thermal radiation - that emitted by a blackbody: The total energy emitted by such a body is ...
star
A cosmic gas ball that is massive enough for pressure and temperatur in its core to reach values where self-sustained nuclear fusion reactions set in. The ...
standard model of elementary particle physics
The current state of the art for describing the basic properties of matter and forces. The standard model theories are based on special relativity and quantum ...
standard model of cosmology
Another name for the big bang models.
spin network
In loop quantum gravity (one of the candidates for a theory of quantum gravity), the underlying microscopic structure of space is a spin network - a graph ...
spin
Fundamental quantum property of elementary as well as of compound particles. For elementary particles, the spin determines whether the particle is a matter ...
sphere
A spherical surface is a simple example for a curved surface. It is easily pictured as a surface embedded in three-dimensional space: in space, a spherical ...
speed of light
The speed at which light or, more generally, electromagnetic radiation propagates through space (especially: through empty space). Central quantity in special ...
spectrum
The electromagnetic radiation reaching us from an astronomical object or other source is a mix of electromagnetic waves with a great variety of frequencies. ...
Space Telescope Science Institute
The institute operating the Hubble space telescope; located in Baltimore, USA. Space Telescope Science Institute website
space-time singularity
See entry singularity, space-time singularity above.
space-time
Already in special relativity, observer in motion relative each other will not, in general, agree as to whether two events happen simultaneously, or as to how ...
space
In a strict sense: Space as we know it from everyday life: the totality of all locations in which objects can sit, with three dimensions. In a more general ...
solution
In the context of general relativity: a solution or, more precisely, a solution of the Einstein equations is a model universe that follows the law of gravity ...
solid state
State of matter in which the atoms or molecules are bound so tightly to each other so that they form a solid, stable lump. In contrast with fluids, whose form ...
solar system
Our cosmic neighbourhood, consisting of a star - the sun -, nine planets orbiting the sun, numerous smaller bodies, dust and gas. In the context of ...
solar mass
The sun has a mass of 1.989ยท1030 kilograms. [Problems reading expressions such as 1030? See exponential notation.] In astronomy, the solar mass is frequently ...
singularity theorems
Theorems, proved by Roger Penrose and Stephen Hawking, that state under which circumstances singularities are inevitable in general relativity. As the theorems ...
singularity
Irregular boundary of space-time in general relativity - region where space-time simply comes to an end. Often, such boundaries are associated with space-time ...
sine
The sine, written sin(x), is a mathematical function that is perfectly regular and repetitive, with maximal and minimal values following each other in endless ...
SI
The international system of physical units, introduced in 1960. It is based on seven fundamental units; in the context of Einstein Online, the interesting ones ...
shear
Generically, an extended body in free fall will experience deformation due to tidal effects. For instance, in a body falling towards Earth, those parts that ...
Shapiro delay
Also: gravitational time delay. In general relativity, not only are light rays deflected, in addition gravity can lead to light taking more time in its travels ...
second
In the International System of units: the basic unit of time. Defined as a certain multiple of the oscillation period of electromagnetic radiation set free in ...
Schwarzschild radius
A measure for the size of a spherically symmetric black hole. It is defined using the area of the black hole's horizon: In usual high school geometry (the ...
Schwarzschild black hole
A solution of Einstein's equations found by Karl Schwarzschild in 1916, which corresponds to a model universe that contains a single, spherically symmetric ...
Ricci singularity
A type of spacetime singularity (i.e. a boundary of spacetime) that is associated with infinitely high energy density. More information about the different ...
rest mass
In special relativity, the (inertial) mass of an object depends on how fast that object moves relative to the observer. The rest mass is the inertial mass of ...
relativity principle
Basic principle of special relativity: for two observers moving relative to each other with constant relative velocity (more specifically: for two inertial ...
relativistic mass
One prediction of special relativity is that, the faster an object already is, the more difficult it is to accelerate it even further. One consequence of this ...