Question: An absorption line in Ca + text { Ca } ^ + Ca + has a wavelength of 3 9 4 nm 3 9

An absorption line in Ca+\text{Ca}^+Ca+ has a wavelength of 394 nm394\,\text{nm}394nm as measured for a stationary source. The same line in the spectrum of Hydra occurs at 475 nm475\,\text{nm}475nm. What can be deduced about the motion of Hydra with respect to the Earth?

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