History of the Universe

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Z redshift

Astronomers calculate red or blue shift values by the following formula:

( femitted – fobserver ) / fobserver

Where femitted is the frequency of the emitted radiation

fobserver is the frequency of unshifted radiation seen by the observer

The following table gives the approximate equivalence between Z and the age after the Big Bang. The figures were obtained using Ned Wright’s Cosmology Calculator using the values Ho = 71, OmegaM = 0.270, Omegavac = 0.730 assuming a flat universe.

Z

After Big Bang

1089

380,000

28.62

108 my

28

112 my

27

118 my

10

482 my

8.6

600 my

5

1.2 gy

4

1.57 gy

3

2.2 gy

2

3.3 gy

1

6 gy

0.5

8.6 gy

0

13.7 gy

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