For small redshifts ($z ext{ less than 1}$), how is the recession velocity ($v$) approximated?
Answer
$v ext{ is approximated as } cz$, where $c$ is the speed of light.
When the redshift is small ($z ext{ less than 1}$), the velocity ($v$) can be calculated using the simple approximation $v ext{ is approximately } cz$.
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