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Details of the atmosphere
•Mostly made of H, He
•Trace amounts of C, N, O, S
•CH4 present as gas
•NH3, NH4SH, H2O can condense in colder upper regions Þ clouds
•Colors from unknown trace chemicals
•Density of gas smoothly increases with depth till point where it is indistinguishable from liquid 
 Þ no real “surface”
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•At very high temperatures and pressures hydrogen becomes a “metal” and conducts electricity
 Þ generates magnetic field
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