Which Two Moons In Our Solar System Have Substantial Atmospheres?


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Nathan Corrie answered
The key word here is 'substantial', The only moon with a known substantial atmospshere (mainly Methane) is TITAN, Saturn's largest moon, and 2nd largest in the solar system after GANYMEDE, Jupiter's largest moon/ GANYMEDE together with the other Galilean moons of IO, CALLISTO and EUROPA are thought to have atmospsheres but these would best be described as tenuous.

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