It can be observed that there is an increase in the wavelength of light received from distant galaxies. The further away the galaxy is, the faster it is moving away from us and the larger the observed increase in wavelength. What is this effect commonly known as?

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It can be observed that there is an increase in the wavelength of light received from distant galaxies. The further away the galaxy is, the faster it is moving away from us and the larger the observed increase in wavelength. What is this effect commonly known as?