English: This is a diagram of a many-layered model of an atmosphere. The bottom 3 layers act like ideal greenhouse gases: they are transparent to solar (UV) light, but absorb infrared radiation from the planet (and adjacent layers). These bottom layers act like blackbodies in the IR. The uppermost layer is a 'skin layer' - a thin layer high in the atmosphere that is theoretically the same in composition as the lower layers, but is thin and diffuse enough that it no longer acts like a perfect blackbody, instead radiating and absorbing in the IR like a graybody.
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