Physics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995natur.374..238d&link_type=abstract
Nature, Volume 374, Issue 6519, pp. 238-240 (1995).
Physics
27
Scientific paper
THERMODYNAMIC and photochemical arguments1-4 suggest that Titan, the largest satellite of Saturn, has a deep ocean of liquid hydrocarbons. At visible wavelengths, Titan's surface is obscured by a thick stratospheric haze, but radar observations5-7 have revealed large regions of high surface reflectivity that are inconsistent with a global hydrocarbon ocean. Titan's surface has also been imaged at infrared wavelengths8-10, and the highest-resolution data (obtained by the Hubble Space Telescope) show clear variations in surface albedo and/or topography10. The natural interpretation of these observations is that Titan, like the Earth, has continents and oceans. But Titan's high orbital eccentricity poses a problem for this interpretation, as the effects of oceanic tidal friction would have circularized Titan's orbit for most configurations of oceans and continents1,11. Here we argue that a more realistic topography, in which liquid hydrocarbons are confined to a number of disconnected seas or crater lakes, may satisfy both the dynamical and observational constraints.
Dermott Stanley F.
Sagan Carl
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