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Learn about planets outside our solar system through Exoplanets and Alien Solar Systems by Tahir Yaqoob, Ph.D., a book in our online store book collection.
This picture shows one of the "seas" on Titan. This picture was made with radar data from the Cassini spacecraft. The colors in the picture have been added. Blue areas are liquid ethane/methane, while brown areas are "dry land". This sea is near Titan's North Pole. It is slightly larger (in area) than Lake Superior on Earth.
Click on image for full size
Image courtesy of NASA/JPL/USGS.

The Poles of Titan

Titan is Saturn's biggest moon. Titan is the only moon in the Solar System with a thick atmosphere. Titan's poles are interesting places. Scientists have discovered lakes at both of Titan's poles. The scientists have also spotted clouds near each of the poles.

Titan is very, very cold. The temperature is around -179 C (-290 F). At that temperature water ice is as hard as rock. There is lots of methane and ethane on Titan. On Earth, methane is a gas. Many people use methane, also called natural gas, as a fuel in their home furnaces. On Titan, the cold temperatures turn methane and ethane into liquids. Titan's lakes and seas are filled with liquid ethane and methane instead of water.

There are hundreds of lakes near Titan's North Pole. There are some that are so big that scientists are calling them seas. There also lakes near the South Pole, though not as many.

Where did the liquid in the lakes and seas come from? Astronomers have spotted clouds over both of Titan's poles. One cloud over the North Pole was really, really big - about half as large as the United States. Maybe methane or ethane rain or snow falls from those clouds to Titan's surface, filling the lakes.

Last modified January 20, 2009 by Randy Russell.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA