The Interior of Saturn

Jonathan J. Fortney, Ravit Helled, Nadine Nettelmann, David J. Stevenson, Mark S. Marley, William B. Hubbard, Luciano Iess

Research output: Chapter in Book/Report/Conference proceedingChapter

6 Scopus citations


We review our current understanding of the interior structure and thermal evolution of Saturn, with a focus on recent results in the Cassini era. There has been important progress in understanding physical inputs, including equations of state of planetary materials and their mixtures, physical parameters like the gravity field and rotation rate, and constraints on Saturnian free oscillations. At the same time, new methods of calculation, including work on the gravity field of rotating fluid bodies, and the role of interior composition gradients, should help to better constrain the state of Saturn’s interior, now and earlier in its history. However, a better appreciation of modeling uncertainties and degeneracies, along with a greater exploration of modeling phase space, still leave great uncertainties in our understanding of Saturn’s interior. Further analysis of Cassini data sets, as well as precise gravity field measurements from the Cassini Grand Finale orbits, will further revolutionize our understanding of Saturn’s interior over the next few years.

Original languageEnglish (US)
Title of host publicationSaturn in the 21st Century
PublisherCambridge University Press
Number of pages25
ISBN (Electronic)9781316227220
ISBN (Print)9781107106772
StatePublished - Jan 1 2018

ASJC Scopus subject areas

  • General Physics and Astronomy


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