If the telescope were to look for a very distant galaxy, receding from us at 0.99 times the speed of light, it might seek to observe the Lyman alpha line of atomic hydrogen. It would be absorbed or emitted by hydrogen atoms in the galaxy with a wavelength of 121 nanometers (nm). What wavelength would the telescope find for this light, as it sees it, arriving from the distant galaxy?

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The observed wavelength of light from a distant object moving away from ... View the full answer