Scientists are particularly interested in Saturn's moon Titan because it's one of the few known moons with its own dense atmosphere. Titan's atmosphere is also thought to be very similar to what Earth's atmosphere was a long time ago. By learning about Titan, we'll learn about our own planet.
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The NASA Astrobiology Institute
The NASA Astrobiology Institute leads collaborative multidisciplinary research and education in astrobiology and supports research teams from academia, institutes and NASA laboratories and centers. http://nai.arc.nasa.gov/