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http://en.wikipedia.org/wiki/Redshift

Redshift

From Wikipedia, the free encyclopedia

In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, "redder" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.

Some redshifts are an example of the Doppler effect, familiar in the change in the apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is Cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshifts are a relativistic effect observed in electromagnetic radiation moving out of gravitational fields.


A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such










http://www.cswap.com/1995/Johnny_Mnemonic/cap/en/25fps/a/01_20


Johnny Mnemonic


1:20:53
Find the third image.

1:20:56
I knew their secrets.

1:20:59
The image...

1:21:02
the company has forgotten for me.

1:21:05
Now they erase me...

1:21:08
burn me out of the mainframes.

1:21:10
One memory after another.

1:21:13
How very kind of them.



- posted by H.V.O.M - Kerry Wayne Burgess 11:53 AM Pacific Time somewhere near Seattle Washington USA Thursday 17 April 2014