If the peak wavelength of a star at rest is 660 nm, but astronomers on earth...

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If the peak wavelength of a star at rest is 660 nm, but astronomers on earth...

If the peak wavelength of a star at rest is 660 nm, but astronomers on earth observer that is has been shifted by 0.001 nm. Then how fast is the star moving relative to the earth?

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If the peak wavelength of a star at rest is 660 nm, but astronomers on earth...