- a four-dimensional continuum with four coordinates, the three dimensions of space and that of time, in which any event can be locatedalso called space-time continuum
- the physical reality inherent in such a continuum

# space-time

space-time

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## space-time

noun

*Physics*

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**General Relativity**, space-time is thought to be curved by the presence of mass, much as the space defined by the surface of a piece of paper can be curved by bending the paper.

See more at relativity

**Albert Einstein's theory of**

*A Closer Look**General Relativity,*published in 1915, extended his theory of

*Special Relativity*to systems that are accelerating. One of the primary causes of acceleration in the universe is gravity, and Einstein showed that the effects of acceleration are actually the same as those of the force of gravity; in fact, they are locally indistinguishable. For instance, both in an accelerating rocket in space and in a rocket standing on its launch pad on Earth, the astronauts are pushed back into their seats. Unlike Newtonian physics, which views gravity as an attractive force between all bodies in the universe, General Relativity describes the universe in terms of a continuous

*space-time*fabric that is curved by masses located within it. In the space-time continuum of General Relativity, events are defined in terms of four dimensions: three of space, and one of time, with one coordinate for each dimension; we continuously “move” along the time dimension. What does it mean, though, for space-time to be curved? One way of conceptualizing this is to imagine just a two-dimensional space-time, with one spatial dimension and one time dimension. But instead of an infinite plane, imagine a tube, with an object's position in time defined by a coordinate of length along the tube, and position in space by a coordinate around the circumference of the tube. An object traveling uniformly through space then describes a helix along this tube, eventually returning to its starting space-coordinate position, but at a different time. (It is an open question in cosmology as to whether our universe has a similar curvature in three dimensions; if so, traveling in one direction long enough would bring you back to where you began.) An important consequence of the notion of curved space-time is that the curvature should affect all motion; thus, even light, which has no mass, should follow a curved path wherever gravity has warped space-time. An important verification of this—which made headlines around the world—took place during a solar eclipse on May 29, 1919, when it was observed that light from stars near the Sun was bent by an angle exactly predicted by the expected curvature of space-time near the massive Sun. Space-time can in principle be warped so strongly by a huge mass that any radiation emitted from the mass curves back in again and cannot escape. These huge masses are thought to exist as

*black holes*.

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(*countable and uncountable*, *plural* spacetimes)

- (uncountable, physics) The four-dimensional continuum of the three spatial dimensions plus time.
- An event is a point in spacetime, specified by the coordinates x,y,z and t.

- (physics) An
*n*-dimensional continuum consisting of dimensions of both space & time. Normally spacetime is considered as having 4 dimensions (*x*,*y*,*z*,*t*), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory. - (physics) A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.
- "a Schwarzschild spacetime," "a Reissner-Nordström spacetime," etc. as opposed to sense (2) describing the universe's spacetime as a whole: "a Minkowski spacetime," "a 5-dimensional spacetime," etc.

(*uncountable*)

- (physics) Alternative form of
*spacetime*.

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## space/time - Computer Definition

The following units of measure are used to define digital capacities and speeds. For measurements of a meter, see metric system. See binary values, NIST binary and long scale.
*********************************
*********** S P A C E ***********
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** 10 to the**
**Bits or Bytes Power of:**
Kilo (K) Thousand 3
Mega (M) Million 6
Giga (G) Billion 9
Tera (T) Trillion 12
**Bytes**
Peta (P) Quadrillion 15
Exa (E) Quintillion 18
Zetta (Z) Sextillion 21
Yotta (Y) Septillion 24
Bronto Octillion 27
Geop Nonillion 30
** Storage Capacity Is Measured in:**
CPU word size bits
Disk/tape/USB drive bytes
Memory (RAM) bytes
Memory chip bits
**********************************
************ T I M E ***********
**********************************
**Fractions of a second 10 to the**
**Second Power of:**
Millisecond (ms) Thousandth -3
Microsecond (Âµs) Millionth -6
Nanosecond (ns) Billionth -9
Picosecond (ps) Trillionth -12
Femtosecond (fs) Quadrillionth -15
Attosecond (as) Quintillionth -18
Zeptosecond (zs) Sextillionth -21
Yoctosecond (ys) Septillionth -24
**Transmit/Transfer Speed Measured in:**
Parallel bus/channel bytes/sec
Parallel disk drive bytes/sec
Serial bus/channel bits/sec
Serial disk drive bits/sec
Network & communications bits/sec
Disk access time ms
Memory access time ns
Machine cycle Âµs, ns
Instruction execution Âµs, ns
Transistor switching ns, ps, fs
** CPU Speed - Clock Cycles Per Second**
See Hertz.
kilohertz (kHz) thousand
megahertz (MHz) million
gigahertz (GHz) billion
terahertz (THz) trillion

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