As the light was shifted towards the red end of the spectrum (lower frequency/longer wavelength) this phenomenon was termed 'redshift'. Figure caption, Lower diagram shows spectrum of light ...

Since the universe is still expanding, with each passing year a galaxy is a bit more distant, and that means its redshift should become slightly larger. In other words, cosmic expansion means that ...

The ratio between redshift and distance is the Hubble ... published theory of general relativity could predict an expanding universe, and that the implications of this would be galaxy redshifts ...

Astronomers see red-shift in virtually all galaxies. It is a result of the space between the Earth and the galaxies expanding. This expansion has the effect of increasing the wavelength of the ...

This finding led to the realization that the universe is expanding, forming the foundation of modern cosmology, including the concepts of redshift and the Hubble Constant. This momentous discovery ...