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This paper presents an experimental and theoretical investigation of the interaction between a thin blade penetrator and materials representative of what is expected for the outermost 20cm of a comet's nucleus. The blade dimensions investigated are thicknesses of 1, 1.5mm and 2mm, width of 120 to 184 mm, surface contact speeds of 0 to 15m/s, and penetration depth of up to 140mm. Earth snow is used...