Explain what is meant by the term cosmological redshift, and contrast it with the Doppler shift that is observed when a luminous object recedes from an observer. From the defi- nition of redshift in terms of the observed and emitted wavelengths of photons, obtain an expression th
Explain what is meant by the term cosmological redshift, and contrast it with the Doppler shift that is observed when a luminous object recedes from an observer. From the defi- nition of redshift in terms of the observed and emitted wavelengths of photons, obtain an expression th
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Explain what is meant by the term cosmological redshift, and contrast it with the Doppler
shift that is observed when a luminous object recedes from an observer. From the defi-
nition of redshift in terms of the observed and emitted wavelengths of photons, obtain an
expression that relates redshift to the expansion factor of the Universe. Hence calculate the
expansion factor of the Universe while a photon travels from a galaxy with redshift z = 1.
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