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Physics - Formulas - Relativistic Redshift

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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