Enceladus' Water Vapor Plume

@article{Hansen2006EnceladusWV,
  title={Enceladus' Water Vapor Plume},
  author={Candice J. Hansen and Larry W. Esposito and A. Ian F. Stewart and Joshua E. Colwell and Amanda R. Hendrix and Wayne R Pryor and Donald E. Shemansky and Robert A. West},
  journal={Science},
  year={2006},
  volume={311},
  pages={1422 - 1425}
}
The Cassini spacecraft flew close to Saturn's small moon Enceladus three times in 2005. Cassini's UltraViolet Imaging Spectrograph observed stellar occultations on two flybys and confirmed the existence, composition, and regionally confined nature of a water vapor plume in the south polar region of Enceladus. This plume provides an adequate amount of water to resupply losses from Saturn's E ring and to be the dominant source of the neutral OH and atomic oxygen that fill the Saturnian system. 
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448 Citations
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448 Citations

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TLDR
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TLDR
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TLDR
The Cassini magnetometer has detected the interaction of the magnetospheric plasma of Saturn with an atmospheric plume at the icy moon Enceladus, consistent with local outgassing activity via a plume from the surface of the moon near its south pole.
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TLDR
Observations of Saturn's satellite Enceladus using Cassini's Visual and Infrared Mapping Spectrometer instrument were obtained during three flybys in 2005, and upper limits of 140 kelvin are derived for the temperatures in the tiger stripes.
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References

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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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