Deep Impact images of the nucleus of comet Tempel 1 reveal pervasive layering, possible
impact craters, flows with smooth upper surfaces, and erosional stripping of material.
There are at least 3 layers 50 – 200 m thick that appear to extend deep into the nucleus,
and several layers 1 – 20 m thick that parallel the surface and are being eroded laterally.
Circular depressions show geographical variation in their forms and suggest differences
in erosion rates or style over scales > 1km. The stratigraphic arrangement of these
features suggests periods of little erosion. Smooth surfaces trending downlsope suggest
some form of eruption of materials from this highly porous object. The Deep Impact
images show that the nucleus of Tempel 1 cannot be modeled simply as either an
onion-layer or rubble pile structure.