Observed to emit at a wavelength of roughly

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In a lab here on Earth, ionized hydrogen gas emits brightly at a wavelength of 6563A °.Similar ionized gas in M31 (or the Andromed a galaxy) is observed to emit at a wavelength of roughly 6547A °. What does this tell us about the motion of M31 relative to the Milky Way?

Reference no: EM131501969

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