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Geography, 07.11.2019 06:31 bribaby74

The spectrum of galaxy a and galaxy b both contain the h-alpha emission line, which is normally seen at 653nm. however, in galaxy a the line has an observed wavelength of 710nm, whereas in galaxy b the wavelength is 685nm. which galaxy is farther away?

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The spectrum of galaxy a and galaxy b both contain the h-alpha emission line, which is normally seen...

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