Photometric redshift, often abbreviated as "photo-z," is a method used in astrophysics and cosmology to estimate the redshift of astronomical objects, particularly galaxies, based on their observed colors in various photometric bands rather than through spectroscopic measurements. The redshift is a measure of how much the light from an object has been stretched due to the expansion of the universe and can provide crucial information about the object's distance, age, and motion.
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