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The H line of hydrogen corresponds to a wavelength of 486.133 nm when measured in a lab on Earth.

The Hβ line of hydrogen corresponds to a wavelength of 486.133 nm when measured in a lab on Earth. In observations of the star Megrez in Ursa Major, the absorption line for Hβ is observed at a wavelength of 486.112 nm. What can we say about the radial motion of Megrez along the line of sight from Earth?

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