Unformatted text preview: Earth 's, Uranus's atmosphere has no mesosphere . The troposphere hosts four cloud layers: methane clouds at about 1.2 bar , hydrogen sulfide / ammonia clouds in at 3–10 bar, ammonium hydrosulfide clouds at 20–40 bar, and finally water clouds below 50 bar. Only the upper two cloud layers have been observed directly—the deeper clouds remain speculative. Above the clouds lie several tenuous layers of photochemical haze. Discrete bright tropospheric clouds are rare on Uranus, probably due to sluggish convection in the planet's interior. Nevertheless observations of such clouds were used to measure the planet's zonal winds, which are remarkably fast with speeds up to 240 m/s. Little is known about the Uranian atmosphere as to date only one spacecraft, Voyager 2 , which passed by the planet in 1986, has studied it in detail. No other missions to Uranus are currently scheduled....
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- Fall '10