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- W1679043008 abstract "Introduction The Late Heavy Bombardment (LHB) was a period of intense meteoroid bombardment of the inner solar system that ended approximately 3.8 Ga [e.g., 1–3]. It has been suggested that the LHB was initiated by the migration of Jupiter and Saturn, causing Main belt asteroids (MBAs) to become dynamically unstable [4, 5]. Models for the LHB involving planet migration invoke gravitational interactions between the giant planets and a massive primordial icy planetesimal disk [4, 6–8]. This process inevitably leads to a large number of cometary impacts (from impactors originating from the outer icy disk) onto the inner planets that is comparable to or exceeds the number of asteroidal impacts (from impactors originating from the main asteroid belt) [4]. However, the cratering record on Mercury, the Moon, and Mars suggests that the craters associated with the LHB were caused by impactors originating from the main asteroid belt [9]. Gomes et al. (2005) showed that under the “Nice model” of giant planet migraion, the majority of the cometary impactors struck the Moon prior to the arrival of the asteroidal impactors. It is possible that there were enough asteroidal impacts to erase an earlier cometary cratering record, however this hypothesis has never been tested. Here we use attempt to quantify the amount of asteroidal material needed to erase a preexisting cometary cratering record." @default.
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- W1679043008 date "2008-11-01" @default.
- W1679043008 modified "2023-10-16" @default.
- W1679043008 title "Can Impactors from the Main Asteroid Belt Erase a Cometary Cratering Record on the Moon" @default.
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