This
is one of the highest resolution images ever taken from an orbiting
or flyby spacecraft. This Viking 2 Orbiter image shows the surface
of Mars' moon Deimos from a distance of 30 km. The image covers
an area 1.2 km by 1.5 km and features as small as 3 meters across
can be seen. Note many of the craters are covered over by a layer
of regolith estimated to be about 50 meters thick. Large blocks,
10 to 30 meters across, are also visible. North is at 11:30.
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