William C Mahaney

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The Younger Dryas impact hypothesis posits that a cosmic impact across much of the Northern Hemisphere deposited the Younger Dryas boundary (YDB) layer, containing peak abundances in a variable assemblage of proxies, including magnetic and glassy impact-related spherules, high-temperature minerals and melt glass, nanodiamonds, carbon spherules, aciniform(More)
Introduction: A fundamentally new scientific mission concept for remote planetary surface and subsurface reconnaissance recently has been devised [1-3] that soon will replace the engineering and safety constrained mission designs of the past, allowing for optimal acquisition of geologic, paleohydrologic, paleoclimatic, and possible astrobiologic information(More)
A " tier-scalable " paradigm integrates multi-tier (orbit⇔atmosphere⇔surface/subsurface) and multi-agent (orbiter(s)⇔blimps⇔rovers, landers, drill rigs, sensor grids) hierarchical mission architectures [1-4], not only introducing mission redundancy and safety, but enabling and optimizing intelligent, unconstrained, and distributed science-driven exploration(More)
Recent speculation [1] on the origin of 'blueberries'— concretionary Fe-rich nodules—on Earth and their relationship to similar concretionary forms on Mars invokes a process of variable redox conditions in underground fluids penetrating porous sediment and precipitating hematite/goethite rich material. The presence of concretions on Mars likely involves a(More)
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