What surface feature on a recovered space rock is described as looking like thumbprints pressed into clay, caused by uneven melting?
Answer
Regmaglypts
Regmaglypts are distinct shallow depressions found on the surfaces of some meteorites. They are formed during the passage through the atmosphere as the ablation process—the removal of surface material due to heat and friction—occurs unevenly across the rock's surface. This uneven melting creates indentations that strikingly resemble the marks left when a thumb is pressed into soft clay. While not always present, their existence is considered a strong indicator of atmospheric entry, often appearing alongside the general fusion crust.
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