A similar ionized gas in m31 or the andromed a galaxy is


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?

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Physics: A similar ionized gas in m31 or the andromed a galaxy is
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