The redshift of a galaxy is observed to be 0.5. Calculate the recessional velocity of the galaxy.
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Q: how far away is the galaxy
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- When a light source moves away from the observer the wavelength will shift towards the red region of the spectrum with a decrease in frequency. This is known as redshift.
- The velocity at which the source is moving away from the observer will be given by,
Here v is the recessional velocity, c is the speed of light, and z is the redshift.
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