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What common principle do red and blue shifts share?

Updated: 8/20/2019
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Both the Red and Blue shifts are qualities of the doppler effect. Using the example of a speed of light (SOL) traveler speeding along at 186,000 miles in one second, to or from Earth, the SOL traveler would be perceived by an individual on Earth as being in motion via a shift in light's radiated wavelength toward the blue of red spectrum respectively. Another way of thinking about this is that the wavelength of light, to or from Earth, would be compressed (blue shifted) or dilated (red shifted). Alternatively the SOL traveler should observe an individual on Earth as being at rest (blue or red shifted) relative to their own SOL motion to or from Earth.

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Q: What common principle do red and blue shifts share?
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