The upper atmospheres of gas giants are mostly methane gas, which weakly scatters blue light just like air on Earth does. If you were looking down into a vast ocean of methane, it would appear blue. This is exactly what we would see if we looked at a cloudless gas giant, a deep blue world highlighted with white clouds wherever the temperature fell low enough. Such planets may even have ice caps of white clouds at the cooler poles.
Posted on: Wed, 25 Jun 2014 15:08:47 +0000
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