Author/Authors :
Thomas، نويسنده , , Peter C. and Veverka، نويسنده , , J. and Belton، نويسنده , , Michael J.S. and Hidy، نويسنده , , Alan and AʹHearn، نويسنده , , Michael F. and Farnham، نويسنده , , T.L. and Groussin، نويسنده , , Olivier and Li، نويسنده , , Jian-Yang and McFadden، نويسنده , , Lucy A. and Sunshine، نويسنده , , Jessica and Wellnitz، نويسنده , , Dennis and Lisse، نويسنده , , Carey and Schultz، نويسنده , , Peter and Meech، نويسنده , , Karen J. and Delamere، نويسنده , , W. Alan، نويسنده ,
Abstract :
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 >1 km. The stratigraphic arrangement of these features suggests that the comet experienced substantial periods of little erosion. Smooth surfaces trending downslope 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.
