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Applying the principle of the cosmological redshift placed the quasar at a distance more than 2 billion light-years away.

He found his explanation in a phenomenon that science knows as the cosmological redshift.

If a galaxy is too far out, its optical light is shifted outside the visible range and into the infrared regime; this is a consequence of the cosmological redshift, in which the expansion of the universe stretches out the wavelengths of light traveling through enormous expanses of intergalactic space.

The distance to a galaxy is measured with an ingenious technique based on the concept of cosmological redshift, which arises from the expansion of the universe: the more distant a source is, the faster it moves away from us, and the receding velocity of these faraway galaxies shifts the wavelengths of their spectra.