Results 151 to 160 of about 7,916,508 (186)

Lunar and terrestrial impact crater spherules

The Moon, 1973
Comparisons between the chemistry of impact debris, especially spherical droplets of impact-formed material, are made for lunar samples and for soil samples taken from terrestrial impact sites. Differences are assigned to differences in the chemistry of impacting bodies and in the surface rocks, and to the influence of the atmosphere in the terrestrial
openaire   +1 more source

Thickness determinations of the lunar surface layer from lunar impact craters

Journal of Geophysical Research, 1968
Small, fresh lunar craters with normal, central-mound, flat-bottomed, and concentric geometry are widespread on maria surfaces. The same types of craters have been produced in the laboratory by impacting projectiles against targets consisting of loose, granular, noncohesive materials overlying cohesive substrates.
William L. Quaide, Verne R. Oberbeck
openaire   +1 more source

Projectile remnants in central peaks of lunar impact craters

Nature Geoscience, 2013
Unusual minerals observed in lunar craters were thought to originate from beneath the Moon’s surface. Numerical simulations show that rather than being vaporized, much of the impactor material can survive in the crater, implying that the unusual minerals come from the impactor and may not be indigenous to the Moon.
Z. Yue, B. C. Johnson, D. A. Minton, H. J. Melosh, K. Di, W. Hu, Y. Liu   +6 more
openaire   +1 more source

Impact Cratering Experiment for a Course in Lunar and Planetary Geology

Journal of Geological Education, 1980
We developed an inexpensive and safe laboratory experiment that accurately duplicates the shapes and structures of simple impact craters. The craters are produced in a layered target of fireplace ash and finely ground charcoal by a blast from an air gun.
Eugene I. Smith, Michael J . Slagle, Stephen Luzader   +2 more
openaire   +1 more source

The role of rim slumping in the modification of lunar impact craters

Journal of Geophysical Research: Solid Earth, 1979
Wall failure has significantly altered the structure of virtually all large, fresh‐appearing lunar craters. Terrace blocks exposed upon a crater's interior walls are interpreted to be sections of the transient cavity rim that slumped into the cavity during the terminal stages of crater formation.
Mark Settle, James W. Head
openaire   +1 more source

Generation of magma at lunar impact crater sites

Nature, 1974
MANY lunar craters have lava flows associated with them. It is widely accepted that, in most cases, the craters are the result of meteoric impact and not volcanic activity but, if so, the occurrence of lavas needs explaining. It is commonly supposed that the lava flows are material that was melted during the impact process itself but this is not ...
openaire   +1 more source

A Chang'E-1 global catalog of lunar impact craters

Planetary and Space Science, 2015
Abstract Using Chang'E-1 images and a digital elevation model, we have compiled a global catalog of 106016 impact craters with diameters greater than 500 m. For all the craters, we integrated all the morphologic attributes available and examined the distribution of craters to identify and investigate potential spatial asymmetries.
Jiao Wang, Weiming Cheng, Chenghu Zhou
openaire   +1 more source

The Resultant Craters from Lunar Impact Flashes

IntroductionImpacts are one of the most destructive processes in the solar system, and impact craters have been identified on almost every type of solar system body. The lunar surface is covered in craters ranging from 2500 km in diameter, down to sub-millimetre scale.
Daniel Sheward, Chrysa Avdellidou, Marco Delbo, Anthony Cook   +3 more
openaire   +1 more source

VENUS967GT Catalogue of Impact Craters and Comparison with Martian and Lunar Craters. [PDF]

, 2015
The result of this work is a catalogue of 967 Venusian craters, wherein each crater is registered with the used topography and optical images. Using a crater detection algorithm (CDA), these craters were compared with Martian and Lunar craters.
openaire   +1 more source

Schroeter's rule and the modification of lunar crater impact morphology

Journal of Geophysical Research, 1967
The 1∶1 correspondence of crater rim volume to true crater volume allegedly observed for many lunar craters has been explained previously by the theories of explosive meteoritic impact. In fact, the equality occurs too infrequently to be of genetic significance.
openaire   +1 more source