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Spectra of Earth's Atmospheric Atmosphere
We're going to have the ability, eventually to image distant exo planets, lots of them. If you can collect enough photons from that planetary image, you can make a spectra. And what are you looking at? You're looking at star light which has passed through the atmosphere of a planet. It bounced off the surface of the planet and come back out through the atmosphere. trace gases in the atmosphere have an opportunity to absorb some of the starlight at fic frequencies. We got a lot of really young, excited and smart astrobiologists asking these questions.