What Is the Best Way to Determine a Galaxy's Redshift

question 74

Multiple Choice

What is the best way to determine a galaxy's redshift?

• A)Find the galaxy's apparent distance,and look up the redshift based on Hubble's law.
• B)Find the color of the galaxy,and estimate its distance based on how red the galaxy is.
• C)Take a spectrum of the galaxy,and measure the difference in wavelength of spectral lines from the wavelengths of those same lines as measured in the laboratory.
• D)Measure the magnitude of the galaxy,estimate its distance,and calculate its redshift using Hubble's law.

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