How would we identify the "red" shift of the celestial objects (with respect to their rapid movement away from each other), if we did not know "red"? Meaning, if we did not have a concept of colors and/or sound?

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MikeAngel

How would we identify the "red" shift of the celestial objects (with respect to their rapid movement away from each other), if we did not know "red"? Meaning, if we did not have a concept of colors and/or sound?

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