Radar Evidence for Liquid Surfaces on Titan

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Science  17 Oct 2003:
Vol. 302, Issue 5644, pp. 431-434
DOI: 10.1126/science.1088969

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Arecibo radar observations of Titan at 13-centimeter wavelength indicate that most of the echo power is in a diffusely scattered component but that a small specular component is present for about 75% of the subearth locations observed. These specular echoes have properties consistent with those expected for areas of liquid hydrocarbons. Knowledge of the areal extent and depth of any deposits of liquid hydrocarbons could strongly constrain the history of Titan's atmosphere and surface.

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