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We have conducted a series of impact experiments to examine the response of very porous foam targets to various impacts. Under near-vacuum conditions, closed-pore and open-pore foam targets were subjected to ~1 km s -1 impacts from aluminum and foam projectiles. We found that open-pore targets absorbed the impacts with little or no global fragmentation or noticeable cratering, exhibiting...
Measurements of the densities of interplanetary dust particles and unweathered stone meteorites indicate that both have significant porosity on the microscopic scale. In addition, the chondritic stone meteorites are generally inhomogeneous, typically consisting of strong, millimeter-size, olivine chondrules embedded in a weaker, fine-grained matrix. Since target porosity is known to influence energy...
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