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

question 112

Multiple Choice

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

• A)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.
• B)Measure the magnitude of the galaxy, estimate its distance, and calculate its redshift using Hubble's Law.
• C)Find the color of the galaxy, and estimate its distance based on how red the galaxy is.
• D)Find the galaxy's apparent distance, and look up the redshift based on Hubble's Law.

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