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allegra d Using an analytic model, Catling, professor of Earth and space sciences, ??and Robinson, a postdoctoral researcher in astronomy, show that at high altitudes atmospheres become transparent to thermal radiation due to the low pressure. Above the level where the pressure is about 0.1 bar, the absorption of visible, or ultraviolet, light causes the atmospheres of the giant planets ??? and Earth and Titan ??? to grow warmer as altitude increases.