Spacetime is a fascinating topic to physicists and astronomers. It all began in 1905 when Albert Einstein published the Special Theory of Relativity, which showed that space and time are both altered near the speed of light.
Spacetime :
Spacetime, in physical science, single concept that recognizes the union of space and time, posited by Albert Einstein in the theories of relativity (1905, 1915).
Spacetime
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Spacetime Wrinkles Glossary -- Part of the Spacetime Wrinkles exhibit of the Science for the Millennium online exposition prepared by the Education and Outreach Group at the National Center for Supercomputing Applications (NCSA).
Spacetime
Main article: Spacetime
Although at speeds small compared to c a runner in a train appears to a ground observer to travel at a speed that is the sum of the train and the runner speeds, ...
Spacetime Diagram - A diagram showing one spatial coordinate against time, in which the paths of bodies and beams of light can be plotted ...
Special spacetime geometries
The general theory of relativity extends the special theory
Special relativity ...
spacetime A synthesis of the three dimensions of space and of a fourth dimension, time; a hallmark of relativity theory.
Spacetime
The four-dimensional coordinate system (three dimensions of space and one of time) in which physical events are located.
Spectral Class (Spectral Type) ...
Spacetime curvature is also expressed with respect to a covariant derivative, nabla, in the form of the Einstein tensor - G_{mu nu}. This curvature is related to the stress-energy tensor - T_{munu} - by the key equation ...
Spacetime - The combination of three spatial coordinates and one time coordinate that we use to locate an event
Spacetime Diagram - A diagram showing one spatial coordinate against time, in which the paths of bodies and beams of light can be plotted ...
A spacetime diagram exhibiting the properties of the Schwarzschild metric by eliminating the formal singularity that appears at the Schwarzschild radius in the form in which the metric is usually written.
SpaceTechSpacetime (disambiguation)Spacetime continuum
SpacewarSpaceward Ho!Spacewarp toy
SpacewatchSPACEWAY-1SPACEWAY-2 ...
A space (and spacetime) dimension that is large and directly apparent; a dimension with which we are ordinarily familiar, as opposed to a curled-up dimension. [G99]
Extended Inflationary Universe ...
1923 - George Birkhoff proves that the Schwarzschild spacetime geometry is the unique spherically symmetric solution of the Einstein vacuum field equations, ...
In the first half of the 20th century, the word Universe was used to mean the whole spacetime continuum in which we exist, together with all the energy and matter within it.
Number counts: For any set of sources with the same luminosity L and constant space density r, in the approximation of flat spacetime the observed distribution of fluxes S will have the number of sources brighter than S given by N(> S) ~ ...
derivation of the cosmological redshift.) I believe that the true answer will not come out until we have a quantum theory of gravity and it will be discovered that the boundary conditions of the photon are connected to the geometry of spacetime.
Einstein's general theory of relativity shows that a very large amount of mass can bend the path of light and warp spacetime. This effect is seen in many rich, massive clusters of galaxies.
We have reverted to the familiar notion of gravity, away from the more correct concept of warped spacetime, because speaking in terms of gravity makes our discussion of the evolution of the universe much easier to understand.
The central idea of general relativity is that the existence of mass will affect the spacetime around it. However, we must have a huge mass to see the effect.
: Black Holes and Warped Spacetime. (Agujeros Negros y Espacio-tiempos alabeados). 1979, W.H. Freeman & Sons. Una visión general breve, no técnica.
Parker, B.
The rift produced a powerful chronokinetic surge which interacted with Voyager's warp core, shattering the spacetime continuum aboard the ship, fracturing it in to thirty-seven different time frames.
According to Einstein, the flight of Alice and Bob is continuing on path, it's just that the spacetime path has been distorted by the mass to bring the two paths closer together. They are following the shortest path or "geodesic" through spacetime.
Everything within the event horizon is irreversibly drawn towards this point where the curvature of spacetime becomes infinite and gravity is infinitely strong.
The center of a black hole, where the curvature of spacetime is maximal. At the singularity, the gravitational tides diverge; no solid object can even theoretically survive hitting the singularity.
Explain that the sheet represents spacetime, the large object represents the Sun and the smaller object represents a planet
Have the students pull the edges of the sheet outward. Make sure the sheet is taut.
Roll the lighter balls across the sheet.
Definition: singularity: In astronomy, a term often used to refer to the center of a black hole, where the curvature of spacetime is maximal.
On this scale, the entire geometry of spacetime as predicted by general relativity breaks down. For this reason, current descriptions of the early evolution of the Universe start at tp = 5.39 × 10-44 seconds after the Big Bang.
They are bound together in what is known as spacetime. The universe is not only expanding in space but also in time. However, it is really difficult to visualize 4-dimensional raisin bread, so don't try, it'll just hurt your brain.
Likewise, the gravitational field can have waves that carry energy and are called gravitational waves. These may be thought of as ripples in the curvature of spacetime that travel at the speed of light.
This is because spacetime curves more gently near a large black hole than near a small one. Thus, the material falling into a supermassive black hole remains cooler over this greater amount of material.
7 billion years old, the human lifespan rarely exceeds 110 years. The Earth may be a pinprick in spacetime, but it also hosts what may be the loneliest yet most intelligent life forms in the universe - Homo Sapiens.
Since Acceleration equals Gravity, and Motion (and hence acceleration) affects space and time, then gravity itself distorts space and time. In fact the gravitational force results from distorted (or "curved") spacetime.
(Curiously, Einstein received the Nobel prize in 1921 not specifically for Relativity but rather for his 1905 work on the photoelectric effect and "services to Theoretical Physics".) (see Spacetime Wrinkles, an excellent WWW site from NCSA) ...
 See also: Energy, Time, Universe, Light, Mass
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