When dealing with objects that are traveling at or
near the speed of light, we often use the term
"relativistic." When dealing with measurements of
redshift, there are actually two different versions:
In determining recessional velocity
using
redshifts, the above equation is only good for
low speeds. If an object is traveling at or near the
speed of light (or we suspect the object is
traveling that fast), we must use a variation of
this equation to account for the relativistic speed:
By including the values for the
speed of light, we correct for the relativistic
effects.
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