NDLI: Lunar formation. Dating the Moon-forming impact event with asteroidal meteorites.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bottke, W. F. Scott, E. R. D. Weirich, J. R. Swindle, T. Vokrouhlický, D. Marchi, S. Levison, H.
Description	Author Affiliation: Bottke WF ( Southwest Research Institute and NASA Solar System Exploration Research Virtual Institute (SSERVI)-Institute for the Science of Exploration Targets (ISET), Boulder, CO, USA. bottke@boulder.swri.edu.); Vokrouhlický D ( Institute of Astronomy, Charles University, V Holesovickách 2, CZ-18000, Prague 8, Czech Republic.); Marchi S ( Southwest Research Institute and NASA Solar System Exploration Research Virtual Institute (SSERVI)-Institute for the Science of Exploration Targets (ISET), Boulder, CO, USA.); Swindle T ( Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA. SSERVI Center for Lunar Science Exploration, Houston, TX, USA.); Scott ER ( Hawai'i Institute of Geophysics and Planetology, University of Hawai'i at Manoa, Honolulu, Hawai'i 96822, USA.); Weirich JR ( Department of Earth Sciences, Western University, London, ON, Canada.); Levison H ( Southwest Research Institute and NASA Solar System Exploration Research Virtual Institute (SSERVI)-Institute for the Science of Exploration Targets (ISET), Boulder, CO, USA.)
Abstract	The inner solar system's biggest and most recent known collision was the Moon-forming giant impact between a large protoplanet and proto-Earth. Not only did it create a disk near Earth that formed the Moon, it also ejected several percent of an Earth mass out of the Earth-Moon system. Here, we argue that numerous kilometer-sized ejecta fragments from that event struck main-belt asteroids at velocities exceeding 10 kilometers per second, enough to heat and degas target rock. Such impacts produce ~1000 times more highly heated material by volume than do typical main belt collisions at ~5 kilometers per second. By modeling their temporal evolution, and fitting the results to ancient impact heating signatures in stony meteorites, we infer that the Moon formed ~4.47 billion years ago, which is in agreement with previous estimates.
ISSN	00368075
Issue Number	6232
Journal	Science
Volume Number	348
e-ISSN	10959203
Language	English
Publisher	American Association for the Advancement of Science (United States)
Publisher Date	2015-04-17
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	History and Philosophy of Science

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