Redshifted refers to the phenomenon where the light from an object moving away from an observer is shifted toward longer wavelengths, making it appear redder than it actually is. This effect is significant in cosmology as it provides evidence for the expanding universe, allowing scientists to measure the velocity of distant galaxies and understand the properties of cosmic structures like the Cosmic Microwave Background (CMB). Redshift helps us learn about the history and evolution of the universe by revealing how far away and how fast celestial objects are moving from us.
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