Collisionally Processed Rocks on Mars

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Science  24 Sep 1999:
Vol. 285, Issue 5436, pp. 2105-2107
DOI: 10.1126/science.285.5436.2105

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The Pathfinder landing site on Mars has boulders that may be cratered (Stimpy), split (Chimp), fragmented (Book End and Flat Top), or otherwise partly destroyed (Yogi and Frog) by collisional processes. Atmospheric-entry calculations show that centimeter-sized projectiles survive passage through the martian atmosphere and encounter the surface of Mars at velocities of a few kilometers per second. Craters less than 1 meter in diameter may contribute to the evolution of the martian surface and its soils.

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