Hubble Space Telescope images of Titan's surface
Both of these images were taken with the HST Planetary Camera and
have been deconvolved with the Lucy algorithm to sharpen the features.
North is up and (geographical) east is to the right.
The left image was taken at an orbital longitude of
45 E (geographical coordinates), and shows the "dark side" of Titan. The right
image was taken about 130 hours later at a longitude of 285 E,
and shows a bright feature
coming onto the disk from the west (left).
Note that in both images, Titan is limb-brightenned, that is, the
limb is brighter than the center of the disk. This is especially
true in the earlier image, and in the southern hemisphere of both images.
The limb-brightening alone suggests that we are seeing the surface, as
atmospheres are typically limb darkenned. A dark surface, or
a strong absorption, under a bright haze causes limb brightening
due to the longer path through the haze at the limbs. The haze
is also thought to be thicker in the south currently (opposite
its state at the time of the Voyager encounter).
Both images are shown with the same stretch.