HydroJovian Type

Temperate gas giants with clouds predominantly consisting of water vapour

Danzig and moon
Image from Steve Bowers
The temperate gas giant Danzig, showing the typical white and blue colours of these worlds. Moons of these temperate gas giants are often good candidates for terraforming; some may already hold life.
The temperature ranges of these worlds is -123 to 76 degrees Celsius, with upper atmospheres composed primarily of water ice, giving them a predominantly white appearance. Cooler polar regions may still support the brown-stained ammonia clouds, although this coloration would typically be rather muted due to the lack of intense solar radiation. Deeper methane clouds would be bluish. The warmer worlds of this Class may form yellow condensates of sulfurous compounds. The predominance of white clouds, however, would provide for high albedos of around 0.8.
Example Danzig

Some HydroJovianworlds have moons on which life has developed. In certain cases microbial life may be transferred into the atmosphere of the gas giant itself, where is may thrive- many life-bearing gas giants are hydrojovian class worlds. These worlds may acquire a wide range of colouration from the atmospheric biomes, for example Silence, Gamma Cephei b
 
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Development Notes
Text by John M. Dollan, with comments by Steve Bowers

Initially published on 31 December 2007.