Late Heavy Bombardment
The term Late Heavy Bombardment (or LHB) corresponds to an elevated frequency of collisions that affected the inner Solar System between 4.0 and 3.8 billion years ago. The Earth preserved no trace of these major impacts, but they can be found on the highly cratered surface of the Moon and other planets such as Mars, or in the age of the impact melt measured on meteorites originating from the asteroid belt. The LHB forms either the slowly decreasing tail end of planetary accretion or a localized cataclysmic event, perhaps triggered by a readjustment of the orbits of the large gas planets long after the formation of the Solar System.
Origin and Duration of the LHB
References and Further Reading
- Hartmann WK, Ryder G, Dones L, Grinspoon D (2000) The time-dependent intense bombardment of primordial Earth/Moon system. In: Canup RM, Righter K (eds) Origin of the Earth and Moon. University of Arizona Press, Tucson, pp 493–512Google Scholar
- Kring DA, Cohen BA (2002) Cataclysmic bombardment throughout the inner solar system 3.9–4.0 Ga. J Geophys Res 107(E2):4-1–4-6. doi:10.1029/2001JE001529Google Scholar
- Ryder G, Koeberl C, Mojzsis SJ (2000) Heavy bombardment on the Earth at 3.85: the search for petrographical and geochemical evidence. In: Canup RM, Righter K (eds) Origin of the Earth and Moon. University of Arizona Press, Tucson, pp 475–492Google Scholar
- Stoeffler D, Ryder G (2001) Stratigraphy and isotopic ages of lunar geologic units: chronological standard for the inner solar system. In: The evolution of Mars. International Space Science Institute, Bern, Switzerland, pp 7–53. Space Sci Rev 96:1–4Google Scholar