The so-called hydrogen-alpha line in hydrogen's spectrum has a wavelength of 656.3 nm (bright red). An observation of this line from a distant star in our galaxy measures the wavelength as 657.9 nm. What is the star's (radial) velocity relative to Earth?
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You observe a spectral line of hydrogen at a wavelength of $502.3 \mathrm{nm}$ in a distant galaxy. The rest wavelength of this line is $486.1 \mathrm{nm} .$ What is the radial velocity of this galaxy?
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