Did the Hilda collisional family form during the late heavy bombardment?
نویسندگان
چکیده
منابع مشابه
The Late Heavy Bombardment of the Moon – an Evolving Problem
The impact record on the Moon has been suggested to show either the tail end of extended accretion or to represent a discrete impact interval extending from about 4 Ga to about 3.45 Ga, the age of the last major dated impact event [1]. Discussion in the literature has largely focused on the interval theory. An early assumption about the nature of the projectiles has suggested them as a swarm of...
متن کاملThe Late Heavy Bombardment of the Moon: a Prospectus
Motivating Problem. The Lunar Late Heavy Bombardment (LHB) defines a time between ∼ 3.8 to possibly 4.1 Gy ago when the basins on the Moon with reasonably well-constrained ages were formed (e.g., Nectaris, Serenitatis, Imbrium, Orientale) [e.g., 1,2]. This topic has been fraught with controversy ever since it was introduced as a means to explain the absence of lunar rocks with isotopic recrysta...
متن کاملAn Inquiry about Evidence for the Late Heavy Bombardment
Introduction: Tera et al. [1] first proposed a "terminal cataclysm" or Late Heavy Bombardment (LHB) based on an apparent spike in lunar rock resetting ages; the LHB has more recently been advocated on the basis of a spike in ages of lunar impact melts, or at least an absence of secure impact melt ages prior to 4 Ga [2-5]. Dates for lunar impact basins [6] from Nectaris (3.90-3.92 Ga) to Orienta...
متن کاملOrigin of the Ganymede–Callisto dichotomy by impacts during the late heavy bombardment
Jupiter’s large moons Ganymede1,2 and Callisto2,3 are similar in size and composition. However, Ganymede has a tectonically evolved surface1 and a large rock/metal core2, whereas Callisto’s surface shows no sign of resurfacing3 and the separation of ice and rock in its interior seems incomplete2. These differences have been difficult to explain4–11. Here we present geophysical models of impact-...
متن کاملSizes of Asteroids Responsible for Large Impact Basins on the Moon during the Late Heavy Bombardment
Introduction: Scaling relations derived from laboratory experiments and dimensional analysis [1] provide first-order estimates for the diameters of objects responsible for craters on the planets. At basin scales, however, the final crater rim may not be preserved due to rim collapse. Assumptions about impactor speed, angle, and density further preclude a unique determinations. As a result, the ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2011
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2011.18587.x