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I had a question about the following chart. What mathematical observation or equation could be made about the data given in respect to the doppler effect? I'm confused if this means that planets are moving at an exponential rate away from us? Would these galaxies appear blue shifted? Thank you in advance for any sort of help.

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  1. Look up the laboratory wavelengths of the Calcium H and K lines

  2. Calculate the redshift implied by the observed wavelengths of the H and K lines. $$ v/c = (\lambda - \lambda_0)/\lambda_0,$$ where $v$ is the implied recession velocity, $c$ is the speed of light, $\lambda$ is the observed wavelength and $\lambda_0$ is the laboratory wavelength.

  3. Plot recession velocity versus distance and see what you get.

  4. Read about the Hubble redshift-distance relation.

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