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==Definition==
[[Redshift]] is often denoted with the variable <math>z\,</math>.
<math>z=\frac{\lambda_o-\lambda_e}{\lambda_e}</math>
Where:
<math>\lambda_o\,</math> is the wavelength of the [[electromagnetic radiation]] ([[photon]]) as measured by the observer.
<math>\lambda_e\,</math> is the wavelength of the [[electromagnetic radiation]] ([[photon]]) when measured at the source of emission.
Gravitational redshift, the displacement of light towards the red, can (for the case of a star) be predicted using the formula provided in the theory of [[General Relativity]] ''([[Albert Einstein]]: Relativity - Appendix - Appendix III - The Experimental Confirmation of the General Theory of Relativity)'':
<math>z_{approx}=\frac{GM}{c^2r}</math>
Where:
<math>z_{approx}\,</math> is the displacement of spectral lines due to [[gravity]] as viewed by a far away observer in [[free space]].
<math>G\,</math> is Newton's [[gravitational constant]] (the variable used by Einstein himself).
<math>M\,</math> is the [[mass]] of the body which the light is escaping.
<math>c\,</math> is the [[speed of light]].
<math>r\,</math> is the radius of the star you consider.
Using the energy-momentum equation relating energy and wavelength of a photon, the gravitational redshift is equivalent to a loss of energy of the photon.
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