We know about this late heavy bombardment (LHB) from dating lunar surfaces. How do we date lunar surfaces?

http://www.lpl.arizona.edu/SIC/impact_cratering/lunar_cataclysm/Lunar_Cataclysm_Page

One big controversy about the idea of the LHB -- and there are many controversies -- is that it is essentially impossible for us ever to figure out if the Earth also had a LHB. We are only able to extrapolate from the Moon. Do you know why we can't figure it out directly for the Earth?

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