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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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Roadmap: NASA and the science community have developed a roadmap that outlines pathways for Astrobiology research and exploration and indicates how they might be prioritized and coordinated. The roadmap embodies the efforts of more than 200 scientists and technologists, including NASA employees, academic scientists whose research is partially funded by NASA grant, and many members of the broader community who have no formal association with NASA.
http://astrobiology.arc.nasa.gov/roadmap/
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