They lack solid surfaces on which to land, plus their fearsome gravity and thick
clouds of ammonium compounds would make departure a task akin to that of an insect struggling free from a piece of flypaper.
The key finding:
cloud particles at the top
of the great storm are composed
of a mix
of three substances: water ice, ammonia ice, and an uncertain third constituent that is possibly
ammonium hydrosulfide.
Rose, D., S.S. Gunthe, E. Mikhailov, G.P. Frank, U. Dusek, M.O. Andreae and U. Pöschl, Calibration and measurement uncertainties
of a continuous - flow
cloud condensation nuclei counter (DMTCCNC): CCN activation
of ammonium sulfate and sodium chloride aerosol particles in theory and experiment, Atmospheric Chemistry and Physics, 8, 1153 - 1179, 2008.