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Titan

Titan (and Dione, a smaller Saturnian moon) as seen by the Cassini spacecraft.
Titan (and Dione, a smaller Saturnian moon) as seen by the Cassini spacecraft. Image: NASA/JPL-Caltech/Space Science Institute

Titan is Saturn’s largest moon, and the second-largest in the solar system after Jupiter’s Ganymede. But Titan is most interesting for its dense atmosphere and massive oceans of methane. NASA has plans to launch a spacecraft there in about five years.

We already have an image from Titan’s surface, taken by the Huygens probe which arrived on the moon in 2005. It gave us a tantalizing enough glimpse to want to return.

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