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If an object can be found whose luminosity you knew absolutely just from looking at it, then by comparing the apparent luminosity with the absolute luminosity, you could figure how far away it was. As the light from a distant object travels to Earth through an expanding universe, the cosmic expansion stretches the distances between galaxy clusters and the wavelengths of the photons emitted from the object. By the time the light reaches us, the spectral wavelength will have been redshifted by exactly the same factor that the universe had been stretched in the time interval since the light left the source...
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