Abstract
Impact craters can be observed on all terrestrial planets and their larger satellites. Basically every body in the solar system with a solid crust, no matter how small it is, exhibits evidence of impacts in the past. For example, the Moon provides an excellent data base of impact craters. However, the major fraction of impact events occurred between 4.6 and 3.9 Billion years ago. The impact frequency at that time was ∼ 100 times larger than it has been ever since. Figure 1 shows the craters Ptolomaeus, Alphonsus, Arzahchel and Albetegnius. The image depicts that impact craters vary form large basins of several 100 kilometres in diameter (the largest impact basin is Valhalla with 4000 km in diameter on the Jovian satellite Callisto) to structures that are only several 10’s of meters in diameter.
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