Recent images of the surface of Mercury have revealed an unusual and intriguing landform: sub-kilometre scale, shallow, flat-floored, steep-sided rimless depressions typically surrounded by bright deposits and generally occurring in impact craters. Hypotheses to explain the volatile-loss have included sublimation and space weathering, and it has been suggested that hollow-forming volatiles are endogenic and are exposed at the surface during impact cratering.
The Mystery of Hollow Places by Rebecca Podos
However, detailed verification of these hypotheses has hitherto been lacking. In this study, we have conducted a comprehensive survey of all MESSENGER images obtained up to the end of its fourth solar day in orbit in order to identify hollowed areas. We have studied how their location relates to both exogenic processes insolation, impact cratering, and solar wind and endogenic processes explosive volcanism and flood lavas on local and regional scales.
We find that there is a weak correlation between hollow formation and insolation intensity, suggesting formation may occur by an insolation-related process such as sublimation. The vast majority of hollow formation is in localised or regional low-reflectance material within impact craters, suggesting that this low-reflectance material is a volatile-bearing unit present below the surface that becomes exposed as a result of impacts. Video: pronunciation of hollow.
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NEW from. Collins English Dictionary. Derived forms. Word origin. Idioms: beat all hollow. All rights reserved. Example sentences including hollow. These examples have been automatically selected and may contain sensitive content.
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Nearby words of hollow. Related terms of hollow. Definition of hollow from the Collins English Dictionary. Quick word challenge Quiz Review. I'm hear all by myself and I know I'm going to get lost. Bearing a grudge that dates back 10, years to the Heresy, these fallen angels are driven by hatred and an overwhelming desire for revenge.
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By the time the Space Wolves arrive, the Red Corsairs are already well entrenched. With neither side prepared to withdraw nor concede defeat, the battle spirals out of control — will the Hollow Worlds be destroyed by the forces of destruction that have been unleashed?
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