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12 years ago
How did Hubble use the cosmological redshift to determine distance?   
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12 years ago
The redshift is caused by the doppler effect as a result of the galaxy's velocity.  Hubble found that when known galactic distances (determined with a standard candle) were plotted with the recessional velocity, all the data fell on a straight line.  The slope of this line is Hubble's constant. This allowed him to use a measured redshift (or calculated velocity) to read the distance off the plot, or to use the equation to calculate the distance.   
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