In the spectrum of the star, the blue hydrogen line with a laboratory wavelength of 486.13 nm is shifted by 4.5 * 10-11 m to the red

In the spectrum of the star, the blue hydrogen line with a laboratory wavelength of 486.13 nm is shifted by 4.5 * 10-11 m to the red end of the spectrum. Determine the direction and magnitude of the speed of the star.

The star moves away from the observer at a speed of about 28 km / s.

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