the average daytime temperature above the ground dropped by 5 degrees Celsius. Studies using computer simulations have investigated the impact of photochemical hazes on exoplanets' thermal structure. Applying this model to hot Jupiters, scientists found that the inclusion of haze for HD 189733 b led to an expansion of the atmosphere, helping to explain an observed steep transit signature in the electromagnetic spectrum. Also, the model for HD 209458 b predicted both photochemical haze and objects like clouds. References Planetary atmospheres Atmospheric dynamics