Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 25, Problem 9Q
To determine

The way in which Doppler shift differs from the cosmological redshift.

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What do the results from the Wilkinson Microwave Anisotropy Probe (WMAP) observations tell cosmologists?
Explain why the universe cannot be older than the Hubble time.
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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