Which moon has the thickest atmosphere among the moons in the solar system?
Quick Answer
Titan, Saturn’s largest moon, has the thickest atmosphere of any moon. Its atmosphere is mostly nitrogen and is denser than Earth’s atmosphere at the surface.
The Full Story
Titan is the only moon in the solar system with a truly substantial atmosphere. Its atmosphere is mostly nitrogen, with methane making up a small but important fraction, and surface pressure is about 1.5 times Earth’s at sea level. Haze in the atmosphere hides the surface in visible light, so spacecraft like Cassini and the Huygens probe were crucial to studying it. Titan also has methane lakes and rivers, making it one of the most Earth-like worlds in the solar system in a chemical sense.
Key Facts
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