Physics, 20.02.2020 23:10 arnold2619

One of the absorption lines of hydrogen has a rest wavelength of 656 nm (at rest means with respect to the observer, like in a lab). You observe several stars and measure the wavelength of this same hydrogen absorption line in each star. Based on the measured wavelength of this line, which star is moving towards the Earth the fastest?

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One of the absorption lines of hydrogen has a rest wavelength of 656 nm (at rest means with respect...