Suppose you were far from a planet that had a very strong gravitational field, and an emission line spectrum source on the surface of the planet. when you observe a similar source in your own spaceship, the wavelength of the light is 656.3 nm. what wavelength do you see when you look at the light source on the planet?
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Suppose you were far from a planet that had a very strong gravitational field, and an emission line...
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