Cassini Observes the Active South Pole of Enceladus

@article{Porco2006CassiniOT,
  title={Cassini Observes the Active South Pole of Enceladus},
  author={Carolyn C. Porco and P. Helfenstein and Peter C. Thomas and Andrew P. Ingersoll and Jack Wisdom and Richard D. West and Gerhard Neukum and Tilmann Denk and Roland J. Wagner and Thomas Roatsch and Susan W. Kieffer and Elizabeth P. Turtle and Alfred S. McEwen and Torrence V. Johnson and Julie A. Rathbun and Joseph Frank Veverka and D. Wilson and J. E. Perry and Joseph Nicholas Spitale and Andre Brahic and Joseph A. Burns and Anthony D. Delgenio and Luke Dones and Carl D. Murray and Steven W. Squyres},
  journal={Science},
  year={2006},
  volume={311},
  pages={1393 - 1401}
}
Cassini has identified a geologically active province at the south pole of Saturn's moon Enceladus. In images acquired by the Imaging Science Subsystem (ISS), this region is circumscribed by a chain of folded ridges and troughs at ∼55°S latitude. The terrain southward of this boundary is distinguished by its albedo and color contrasts, elevated temperatures, extreme geologic youth, and narrow tectonic rifts that exhibit coarse-grained ice and coincide with the hottest temperatures measured in… 

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Cassini's Composite Infrared Spectrometer (CIRS) detected 3 to 7 gigawatts of thermal emission from the south polar troughs at temperatures up to 145 kelvin or higher, making Enceladus only the third known solid planetary body—after Earth and Io—that is sufficiently geologically active for its internal heat to be detected by remote sensing.

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