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Published online by Cambridge University Press: 12 April 2016
Inventories in sizes of large planetesimals can be estimated for different periods in the late planet-forming process by different techniques. For example, tabulations of craters on Mercury, the moon, and Mars give direct evidence of asteroid-like size distribution including bodies in excess of 100 km diameter. Large bodies exceeding, 1000 km diameter probably existed earlier. Consequences of interactions between planets and such bodies are considered.