MPS - Auditorium
MPI für Sonnensystemforschung
Vera Assis Fernandes
The Heavy Bomardement Eon of the Earth-Moon-System.
Introduction: The impact cratering shaped Moon’s landscapes offer a fossil record of the Near Earth Object populations. This record goes back to the formation and cooling of the lunar crust [1-3] when the crust was sufficiently viscous to retain the cratering “scars”. The crater densities of highland and mare surfaces testify a substantially higher impact flux rate during the first ~1.5 Ga compared to that for the last 3 Ga of our Solar System. The temporal evolution of the impact flux (i.e., the bombardment timeline) is the topic of intense scientific debate for at least the past 40 years. The end-member interpretations are 1) the “Early Heavy Bombardment” (EHB) that assumes an exponentially declining impact flux rate until it oscillated around a much lower value during the last 3 Ga, and 2) the “Late Heavy Bombardment” (LHB) referring to a brief “terminal lunar cataclysm” with a sharply rising and falling peak centered around 3.9 Ga ago [1,2].
Kontakt: Urs Mall
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