Results 1 to 10 of about 1,758 (123)
On the Possible Origin of the Lunar Maria [PDF]
Nature, 1966 RECENT close-up photographs of the lunar surface on the western shores of Oceanus Procellarum, televized back to Earth by the Russian soft-lander Luna 9 on February 4, revealed for the first time the detailed micro-structure of typical mare ground down to a cm–mm scale.
Kopal Zdenek
exaly +2 more sources
Depths of Copernican Craters on Lunar Maria and Highlands [PDF]
Earth, Moon, and Planets, 2021 23 pages, 6 ...
E. A. Feoktistova, S. I. Ipatov
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Origin of the Lunar Maria [PDF]
Nature, 1966 THE hypothesis proposed by Kopal1 concerning the origin of the lunar maria is very interesting. However, it is important to note that the distribution of lunar craters on the Earth-turned hemisphere is far from uniform. There are significant, well-marked chains approximately aligned with the central meridian as seen from Earth; in the west (classical ...
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Terraced depressions in Lunar Maria [PDF]
Journal of Geophysical Research, 1971 Some shallow, irregularly shaped mare depressions are bordered by terraces. Morphologic study suggests that some of these depressions are drained lava lakes. If so, mare materials in which they occur originated as lava. Some associated sinuous rills and craters may have had volcanic origins.
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The Anatomical Record, EarlyView.Abstract New data on the equine aortic valve obtained using advanced techniques is especially important given the greater availability of animal models for translational research. Here we characterized the morphological and morphometric aspects of the equine aortic valve from 60 healthy hearts collected at equine abattoirs.
Vitor Pires Pereira +3 more
wiley +1 more source
The Anatomical Record, EarlyView.Abstract Macaws are renowned for processing dry, mechanically resistant fruits, yet the species‐level anatomical and functional correlates of this performance remain incompletely resolved. We examined the feeding apparatus of the Blue‐and‐yellow Macaw (Ara ararauna) using an integrated approach that combines osteology, myology, and bite‐force estimates
Sérgio R. Posso +2 more
wiley +1 more source
A Low‐Power Radioisotope XRF Spectrometer for Detection of Light Elements on Planetary Missions
X-Ray Spectrometry, EarlyView.ABSTRACT Current X‐ray spectrometers for in situ geochemical analysis on planetary missions typically rely either on X‐ray tubes, which demand electrical power and add mass and thermal complexity, or on alpha particle X‐ray spectrometers (APXS) that use rare 244Cm$$ {}^{244}\mathrm{Cm} $$ sources, and come with severe concerns on radiation safety and ...
Leandro Silveri +14 more
wiley +1 more source
On the equipotential surface hypothesis of lunar maria floors [PDF]
Journal of Geophysical Research: Planets, 1999 The equipotential surface hypothesis suggests that lunar maria floors lie on a surface parallel to the selenoid. This is examined using the spherical harmonic representations of the Clementine topography and Lunar Prospector gravity data. It is demonstrated that the floors of both circular and noncircular maria significantly deviate from an ...
Jafar Arkani‐Hamed +2 more
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Geology of the central uplift of the Kamestastin Lake impact structure, Labrador, Canada
Meteoritics &Planetary Science, EarlyView.Abstract The ~28 km Kamestastin (Mistastin) Lake impact structure is a relatively well‐preserved and well‐exposed complex impact structure. The central uplift of this structure is accessible as two islands in the middle of Kamestastin Lake. We present an updated, detailed geological map and description of Horseshoe and Bullseye islands that provides ...
A. C. Singleton, G. R. Osinski
wiley +1 more source
Nanoscale space weathering features in mature lunar soil revealed by TEM and APT
Meteoritics &Planetary Science, EarlyView.Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer +6 more
wiley +1 more source