ArticlesOther Physical Properties

lnterferometric Examination of Small (Glassy Spherules and Related Objects in a 5-Graml Lunar Dust Sample

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Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 742-743
DOI: 10.1126/science.167.3918.742

Abstract

Over two hundred spherules and cylinders were extracted from the lunar dust sample. Sizes ranged from 0.7 to 0.03 millimeters, and most were shiny glassy objects, which were studied by interferometry. This study reveals very high spcular feflection, frequentperfect sphericity, and clear evidence n some objects of micracking and microchipping. Many spheres were once projectiles. Some have inpacted in free flight with much smaller pices of rocky material, which embedded in the surface. It is conjectured that the glassy spherules originated as a gas-blown shower from a pool of molten glass.