The high-resolution images taken in Titans atmosphere by the Descent Imager/Spectral Radiometer (DISR) were spectacular, but not the only surprises obtained during descent. Both DISR and the Doppler Wind Experiment data have given Huygens scientists much to think about.
The irreversible conversion of methane into other hydrocarbons in Titans stratosphere implies a surface or subsurface reservoir of methane. Although the NASA/ESA/ASI Cassini orbiter has not seen a global surface reservoir, and DISR images do not show liquid hydrocarbon pools on the surface either, this instruments images do reveal the traces of flowing liquid.
The DISR imagers provided views of Titans previously unseen surface, thus allowing a deeper understanding of the moons geology. Surprisingly like Earth, the brighter highland regions show complex systems draining into flat, dark lowlands, possibly dry lake or river beds.
Franco Bonacina | alfa
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