Calculate Redshift and Blueshift
Calculator for the blue- or redshift and the resulting radial velocity.
As the Doppler effect for sound, there is also a Doppler effect for light. If a light source moves towards the observer, the distance between the arriving waves gets shorter, the color of light shifts to blue. If a light source moves from the observer away, the distance between the arriving waves gets longer, the color of light shifts to red. This change of color is only perceptible at very high velocity, so redshift and blueshift are most commonly found in astronomy. From the magnitude of color change, the radial velocity can be calculated, which is the velocity away from the observer. Radial velocity is an important dimension at the measurement of stars and galaxies. As the universe expands and so most galaxies move away from us, redshift is more common than blueshift.
Galaxy UDFy-38135539, one of the most distant galaxies known, has a redshift of 8.6. Blue light from there with a wavelength of 450 nanometers reaches us with a wavelength of 4320 nanometers, i.e. already in the mid-infrared.
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