For example, the further a galaxy is from us, the more red it is.
In: Planetary Science
Space is expanding. You can think of this as the universe is basically stretching to get larger. One of the consequences of this is that it also stretches the wavelengths of light traveling through space.
The color of light is tied to its wavelength. So as the wavelength gets longer, it shifts down towards the red side of the spectrum, so visible light gets more red. Hence, redshift.
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