What is the red shift thing with space?

Answer 1

A red shift means wavelengths are getting longer and longer. Think of a car horn if you pass it - the tone get higher as you approach - and lower as you leave.

With light - we are getting the lower noise from all of space - the red shift.

This is what people use to say the universe is expanding.

Answer 2

A redshift can occur when a light source moves away from an observer, corresponding to the Doppler shift that changes the frequency of sound waves. Although observing such redshifts, or complementary blue shifts, has several terrestrial applications (e.g., Doppler radar and radar guns),[1] spectroscopic astrophysics uses Doppler redshifts to determine the movement of distant astronomical objects.[2] This phenomenon was first predicted and observed in the 19th century as scientists began to consider the dynamical implications of the wave-nature of light.

Another redshift mechanism is the expansion of the universe, which explains the famous observation that the spectral redshifts of distant galaxies, quasars, and intergalactic gas clouds increase in proportion to their distance from the observer. This mechanism is a key feature of the Big Bang model of physical cosmology.[3]

Answer 3

Far away galaxies show a shift towards the red of their light.
The shift is proportional to their distance from us.
Such shift has been interpreted as the effect of the velocity they are traveling away from us. Such observation is at the basis of the expansion of the universe theory which, in turn, gave the idea that all the matter was once concentrated in a single point and scattered away by the Big Bang explosion.

Answer 4

GREAT QUESTION!!!!
Ok In My 2 second favorite subjects Physics and Astronomy,the redshift occurs when the electromagnetic radiation, (usually visible light), that is emitted from/or reflected off of an object is shifted towards the red end of the electromagnetic spectrum.
Now more generally, redshift is known as an increase in the wavelength of electromagnetic radiation received by a detector compared with the wavelength emitted by the source. This increase in wavelength corresponds to a decrease in the frequency of the electromagnetic radiation. Conversely, a decrease in wavelength is called blue shift.

Any increase in wavelength is called "redshift", even if it occurs in electromagnetic radiation of non-optical wavelengths, such as gamma rays, x-rays and ultraviolet. This nomenclature might be confusing since, at wavelengths longer than red (e.g., infrared, microwaves, and radio waves), redshifts shift the radiation away from the red wavelengths.

A redshift can occur when a light source moves away from an observer, corresponding to the Doppler shift that changes the frequency of sound waves. Although observing such redshifts, or complementary blue shifts, has several terrestrial applications,spectroscopic astrophysics uses Doppler redshifts to determine the movement of distant astronomical objects.This phenomenon was first predicted and observed in the 19th century as scientists began to consider the dynamical implications of the wave-nature of light.

Another redshift mechanism is the expansion of the universe, which explains the famous observation that the spectral redshifts of distant galaxies, quasars, and intergalactic gas clouds increase in proportion to their distance from the observer. This mechanism is a key feature of the Big Bang model of physical cosmology

Yet a third type of redshift, the gravitational redshift (also known as the smug smart guy Einstein effect), is a result of the time dilation that occurs near massive objects, according to general relativity.
All three of these phenomena, whose wide range of instantiations are the focus of this article, can be understood under the umbrella of frame transformation laws, as described below. There exist numerous other mechanisms with very different physical and mathematical descriptions that can lead to a shift in the frequency of electromagnetic radiation and whose action may occasionally be referred to as a "redshift", including scattering and optical effects (for more see section on physical optics and radiative transfer).

Answer 5

Red shift meens things are going further away from us. They are taking a shift on the spectrum. Blue shift meens they are coming towards us.