A

David

Darling

red shift

redshift

A redshift is the displacement of spectral lines in the spectrum of an object toward longer wavelengths. If caused by the line-of-sight recession of the object (see Doppler effect), as is usually the case, this displacement, when measured, allows the recessional velocity to be calculated. Redshift is given by the formula:

 

redshift

 

Compare with blue shift.