Blog dedicado a cuentos, notas de interés, actividades políticas , sociales, historia, artes culinarias, fiestas patronales, astronomía, ciencia ficción, temas del Medio Ambiente ,y del acontecer Peruano y Mundial desde otro punto de vista ... Muy Personal y diferente!!!. *** Blog Fundado el 03 de Enero del 2008 ***
SEMANA DE YªHWēH: Introducción al Reino
El Reino de YHWH es indefinible a nuestros sentidos, oculto
a la mejor hazaña por entenderlo, pero visible para los nacidos
Contando los días, ...
Hace 2 días
viernes, 13 de enero de 2017
NASA : Well-Preserved Impact Ejecta on Mars .- Efectamiento de impacto bien conservado en Marte
This image of a well-preserved unnamed elliptical crater in Terra Sabaea, is illustrative of the complexity of ejecta deposits forming as a by-product of the impact process that shapes much of the surface of Mars.
Here we see a portion of the western ejecta deposits emanating from a 10-kilometer impact crater that occurs within the wall of a larger, 60-kilometer-wide crater. In the central part is a lobe-shaped portion of the ejecta blanket from the smaller crater. The crater is elliptical not because of an angled (oblique) impact, but because it occurred on the steep slopes of the wall of a larger crater. This caused it to be truncated along the slope and elongated perpendicular to the slope. As a result, any impact melt from the smaller crater would have preferentially deposited down slope and towards the floor of the larger crater (towards the west).
Within this deposit, we can see fine-scale morphological features in the form of a dense network of small ridges and pits. These crater-related pitted materials are consistent with volatile-rich impact melt-bearing deposits seen in some of the best-preserved craters on Mars (e.g., Zumba, Zunil, etc.). These deposits formed immediately after the impact event, and their discernible presence relate to the preservation state of the crater. This image is an attempt to visualize the complex formation and emplacement history of these enigmatic deposits formed by this elliptical crater and to understand its degradation history.
The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.