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What is a red shift?

What is a red shift? Here are some definitions.

Noun
  1. (astronomy) Light spectra shifted towards red, as by elongation of light waves from a source moving away from the detector.
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In both cases, peak wavelength red shift occurs.
This is based on the red shift of starlight from the receding galaxies.
This red shift should result in different relative emissions at different wavelengths.
Secondly, the red shift of the spectral lines would be so great that the spectrum would be shifted out of existence.
The absorption of energy within these areas leads to an increased red shift.
Bandgaps red shift as the temperature goes up.

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