Asteroid shower onto the Moon in the early solar system

Details Asteroid shower onto the Moon in the early solar system Asteroid shower onto the Moon in the early solar system

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006asthe..99..298y&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 99, No. 6, p. 298 - 310 (2006)

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Moon: Impacts, Minor Planets, Moon Craters

Scientific paper

Lunar crater record indicates that the Moon had a huge number of impacts 3.8 billion years ago (which is called the Late Heavy Bombardment (LHB)). After this event, the impact rate became one order smaller. Comparing the size distributions of craters with that of asteroids, we found that there are two kinds of populations that have bombarded on the Moon and other terrestrial planets. One of the projectile populations is the Main Belt Asteroids (MBAs), and the other one is the Near-Earth Asteroids (NEAs). MBAs are responsible for old craters which were created by LHB, while NEAs are responsible for new craters that have been created after LHB was terminated. We think that a potential cause of LHB was migration of outer planets and consecutive moving of strong resonances over the main belt region. This mechanism allows many MBAs to leave the main belt, and then they were transferred to the orbits closer to the inner planets.

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