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Try Again!
You need to be careful when making your measurement of the wavelength shift
observed in M31's spectrum. Use the non-relativistic Doppler shift
formula.
Remember:
- v is negative if the source is moving towards the observer, and the
spectrum is blueshifted (shorter wavelengths).
- v is positive if the source is moving away from the observer, and
the spectrum is redshifted (longer wavelengths).
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