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Cassini, dramatically improving our understanding of the
dune morphology.
Higher-resolution imaging, given Titan's thick atmo-
sphere, likely requires study from closer to the surface. But
here Titan offers exciting possibilities too: flight in Titan's
low gravity and thick atmosphere by both heavier-than-air
and lighter-than-air means (Lorenz 2009) is easier than at
Earth, and rather serious proposals for airships, hot-air
balloons, and most recently airplanes (Barnes et al. 2012)
have been made (Fig.
13.14
).
In the meantime, the Cassini mission is presently ongo-
ing. While the spatial resolution of its instruments will not
increase, the geographical coverage (including the highest-
resolution VIMS data, able to resolve dunes, and opportu-
nities for radar stereo to give topography of dunes and their
settings) will improve over coming years.
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