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2500-15-large satellites

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Crater-Retention<br />

Ages on the<br />

Satellites<br />

• He Played a Important Role<br />

in Defining the Standard<br />

Cratering History For the<br />

Inner Solar System with Its<br />

Heavy Bombardment Ending<br />

About 3.8 Billion Years Ago<br />

• He (and Colleagues)<br />

Concluded That the Heavy<br />

Bombardment Was<br />

Associated with the Entire<br />

Solar System, and Not<br />

Limited to Just the<br />

Terrestrial Planets of the<br />

Inner System

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