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When at rest, hydrogen emits a green-blue line with a wavelength of 487 nm. In a certain galaxy, that same line is measured to

When at rest, hydrogen emits a green-blue line with a wavelength of 487 nm. In a certain galaxy, that same line is measured to have a wavelength of 504 nm. 1. Is the galaxy moving toward or away from us? How do you know? 2. Find the velocity of the galaxy. Show your work.

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