The former is evidently the result of space weathering on Ceres's older surfaces; the latter two are volatile under Cerean conditions and would be expected to either escape quickly or settle in cold traps, and are evidently associated with areas with recent geological activity.
32.
In 1844, Paul Th�nard, son of the French chemist Louis Jacques Th�nard, used a cold trap to separate diphosphine from phosphine that had been generated from calcium phosphide, thereby demonstrating that P 2 H 4 is responsible for spontaneous flammability associated with PH 3, and also for the characteristic orange / brown color that can form on surfaces, which is a polymerisation product.
33.
The upper atmosphere of Jupiter contains small amounts of simple hydrocarbons such as ethane, acetylene, and diacetylene, which form from methane under the influence of the solar ultraviolet radiation and charged particles coming from Shoemaker-Levy 9 . The water cannot come from the troposphere because the cold tropopause acts like a cold trap, effectively preventing water from rising to the stratosphere ( see Vertical structure above ).
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