if Frauenhofer lines are created by a star’s photosphere, how can we determine a planet’s atmosphere when the light passes through? I don’t see earth’s atmosphere on spectra of our sun, or do we just ignore that?
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Earth’s atmosphere will absolutely show up on a spectrum of the sun’s light *if we measure it from the ground*. Another planet’s atmosphere will only absorb light when it passes between the star and us.
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