Labels:hakham | monitor | sky OCR: ATMOSPHERE Data Uranus has a cold hvdrogen- -rich (83% by volume) atmosphere, with a higher percentage of methane (2%) than any other planet. Most of the remainder of the atmosphere is composed of helium. Temperatures near the upper atmosphere (at the tops of the clouds) average -353 F/ -214 C/ 59 K and wind speeds average 580 km (360 miles) per hour. These temperatures are so cold that even methane will condense from agas to liquid; it is proposed that overlying the cloud layers is a layer of liquid methane. iS this layer that causes the absortion of red and near infrared light, which in turn creates the planet blue green appearance. The cloud layers are probably similar to those of Jupiter and Saturn with regions of ammonia, ammounium hydro- sulfide and water ice layers However these lay ...
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