Assertion: belt asteroid | /r/CapableOf | bombard inner solar system bodies
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text: 3 Ga. Based on comparisons of the body size-frequency distribution (SFD) of near Earth objects (NEOs), the crater SFD of inner Solar System bodies such as the Moon, Mercury or Mars and the Main Belt body SFD, it appears likely that predominately Main Belt asteroids bombarded the inner Solar System bodies (see Chap. 7).