Robin canup (3 resultados)
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Librería: Anybook.com, Lincoln, Reino UnidoAnybook.com
Contactar con el vendedorVendedor de 5 estrellasCondición: Usado - Regular
EUR 66,00
Envío por EUR 18,42Se envía de Reino Unido a Estados Unidos de AmericaCantidad disponible: 1 disponibles
Condición: Fair. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,1750grams, ISBN:9780816520732.
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Librería: Better World Books: West, Reno, NV, Estados Unidos de AmericaBetter World Books: West
Contactar con el vendedorVendedor de 5 estrellasCondición: Usado - Bueno
EUR 99,97
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Condición: Very Good. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.
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Editorial: AAAS, New York, 2012
- Primera edición
Librería: Atticus Rare Books, West Branch, IA, Estados Unidos de AmericaAtticus Rare Books
Contactar con el vendedorVendedor de 5 estrellasCondición: Usado
EUR 165,07
Envío por EUR 8,23Se envía dentro de Estados Unidos de AmericaCantidad disponible: 1 disponibles
Añadir al carrito1st Edition. FIRST EDITION IN ORIGINAL WRAPS OF TWO IMPORTANT PAPERS ON THE GIANT-IMPACT THEORY, THE CURRENTLY FAVORED SCIENTIFIC HYPOTHESIS FOR THE FORMATION OF THE MOON. The Giant-Impact Theory is also know as the Giant-Impact Hypothesis, the Big Splash, and the The Impact. "The giant impact believed to have formed the Earth-M…oon system has long been accepted as canon. However, a major challenge to the theory has been that the Earth and Moon have identical oxygen isotope compositions, even though earlier impact models indicated they should differ substantially" (Phys Org Web Portal, 17 October 2012). The significance of Canup's paper is that it "accounts for this similarity in composition while also yielding an appropriate mass for Earth and the Moon" (ibid). Motivated by the work of others on the early dynamical history of the Moon, Robin Canup, working at the Southwest Research Institute in Boulder, CO, developed new models that involve much larger impactors than were previously considered. In the new simulations, both the impactor and the target are of comparable mass, with each containing about 4 to 5 times the mass of Mars. The near symmetry of the collision causes the disk's composition to be extremely similar to that of the final planet's mantle over a relatively broad range of impact angles and speeds, consistent with the Earth-Moon compositional similarities. The new impacts produce an Earth that is rotating 2 to 2.5 times faster than implied by the current angular momentum of the Earth-Moon system, which is contained in both the Earth's rotation and the Moon's orbit" (PHYS ORG, New Model, Oct. 17, 2012). WITHBOUND: This paper by Dr. Matija uk, SETI Institute, and Dr. Sarah T. Stewart at Harvard University proposed that the angular momentum of the early Earth was larger than the present day system. If so, different types of impact events could generate a lunar disk from the same materials that formed the young Earth's mantle. After the impact, an orbital resonance transferred angular momentum away from the Earth-Moon system to reach the present day value" (Stewart, Origin of the Earth and Moon, Web Portal). In other words, in addition to the impacts identified in Canup's paper, uk and Stewart show that impacts involving a much smaller, high-velocity impactor colliding into a target that is rotating very rapidly due to a prior impact can also produce a disk-planet system with similar compositions. "The ultimate likelihood of each impact scenario will need to be assessed by improved models of terrestrial planet formation, as well as by a better understanding of the conditions required for the evection resonance mechanism" (ibid). CONDITION & DETAILS: New York: AAAS. Complete 1st edition in original wraps, complete. 8vo. Fine condition. Pristine.
