Jupiter is no exception. As opposed to Earth, for example, Jupiter's winds appear to speed up the deeper you go into the atmosphere. Scientists found much less water than they expected and much more of the inert gases like krypton and xenon. A series of bombardments with icy comets during Jupiter's formation 4.5 billion years ago could account for the additional gases, but it doesn't explain the mystery of the missing water, according to Donahue. The probe may have entered the atmosphere in a clear zone with few clouds or perhaps there is some mechanism preventing thick cloud formation.
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