This picture from NASA's Cassini spacecraft shows Titan's atmosphere. You can see some of the layers of the atmosphere along the edge of the moon.
Click on image for full size
Image courtesy NASA/JPL/Space Science Institute.
The Atmosphere of Titan
The atmosphere of Titan is made mostly of nitrogen (80-90%), just like the
Earth's atmosphere! Titan is the only other place in the solar system with
an atmosphere made out of the same thing as the Earth's. Titan's atmosphere
is very dense, and the air pressure at the surface is even higher than Earth's
atmospheric pressure.
Titan also has some methane in its air. Sunlight breaks down the methane and
forms other chemicals, too. Those chemicals create layers of haze or smog in
Titan's atmosphere. We can't see through those smog layers, so the new pictures
from the Huygens probe are our first good look at Titan's
surface.
Titan is very cold (-178º C or -288º F). Methane, which is a gas on Earth, turns to liquid in many places on Titan. The Cassini spacecraft has spotted clouds of methane and ethane in Titan's atmosphere. The clouds are near Titan's poles. There is probably even methane and/or ethane
rain and snow on Titan. This
picture shows what the different parts of Titan's atmosphere
might be like.
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