We can define the relationship between ##z## and ##a(t_e)## as,(adsbygoogle = window.adsbygoogle || []).push({});

$$1+z=\frac {a(t_0)=1} {a(t_e)}$$

When we assume ##z=2##, it means that ##a(t_e)=\frac {1} {3}##

Is this means that universe was ##\frac {1} {3}## times smaller then now ?

If its the case then lets suppose ##z=6## which means universe was ##\frac {1} {7}## times smaller, but even in this case it doesnt seem a huge difference between ##z=2## and ##z=6##. But I think there should be a lot of difference.

I am not sure what am I missing.

Thanks

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# I Redshift and Scale factor

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