Dating the Moon-forming impact event with asteroidal meteorites
نویسندگان
چکیده
منابع مشابه
Lunar formation. Dating the Moon-forming impact event with asteroidal meteorites.
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 vel...
متن کاملTerrestrial aftermath of the Moon-forming impact.
Much of the Earth's mantle was melted in the Moon-forming impact. Gases that were not partially soluble in the melt, such as water and CO2, formed a thick, deep atmosphere surrounding the post-impact Earth. This atmosphere was opaque to thermal radiation, allowing heat to escape to space only at the runaway greenhouse threshold of approximately 100 W m(-2). The duration of this runaway greenhou...
متن کاملRemarks on Lunar and Asteroidal Meteorites
schmelzens, und sind die Tektite von ähnlichem Ausgangsstoff abzuleiten, dann muß man jedoch Fraktionierung von Rb und Sr annehmen, um die Abweichung der Tektitenresultate von der „Isochrone" der Gläser zu erklären. Demnach ist es nicht möglich, genauere Folgerungen aus unseren Messungen hinsichtlich des Ursprungs der EK-Tektite zu gewinnen. Es ist jedoch gesichert, daß eine deutliche Ähnlichke...
متن کاملFormation of vesicles in asteroidal basaltic meteorites
Rare asteroidal vesicular basalts have previously been thought to form in surficial lava flows with CO as the vesicle-forming gas. However, vesicular lava flows are unlikely on small, airless bodies such as asteroids. To unravel the origin of these rocks, we analyzed vesicle sizes and abundances for two angrites and two eucrites using high-resolution X-ray computed tomography and conducted nume...
متن کاملThe Earliest Lunar Bombardment Produced by Moon-forming Impact Ejecta
Introduction. The Moon likely formed in a collision between a large protoplanet and the proto-Earth [e.g., 1,2]. This giant impact (GI) occurred during the late stages of Earth’s accretion; the abundance of highly siderophile elements in Earth’s mantle indicate the Earth only accreted ~0.5% of its mass from broadly chondritic projectiles after this time [e.g., 3]. This makes the GI one of the y...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 2015
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.aaa0602