A new chronology for the Moon and Mercury Simone Marchi German Aerospace Center (DLR), Institute of Planetary Research, Rutherfordstr. 2, D-12489 Berlin Dipartimento di Astronomia, Universit`adi Padova, Vicolo dell’Osservatorio 2, I-35122 Padova
[email protected] Stefano Mottola German Aerospace Center (DLR), Institute of Planetary Research, Rutherfordstr. 2, D-12489 Berlin Gabriele Cremonese INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova Matteo Massironi Dipartimento di Geoscienze, Universit`adi Padova, via Giotto 1, I-35137, Padova and Elena Martellato INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova ABSTRACT In this paper we present a new method for dating the surface of the Moon, obtained by modeling the incoming flux of impactors and converting it into a size distribution of resulting craters. We compare the results from this model with the standard chronology for the Moon showing their similarities and discrepancies. In particular, we find indications of a non-constant impactor flux in the last 500 Myr and also discuss the implications of our findings for the Late Heavy Bombardment hypothesis. We also show the potential of our model for accurate dating of other inner Solar System bodies, by applying it to Mercury. arXiv:0903.5137v1 [astro-ph.EP] 30 Mar 2009 Subject headings: solar system: general — planets and satellites: Earth, Mercury, Moon 1. Introduction the evolution of the Solar System and in particu- lar of our own planet, the Earth. Recently, thanks Craters are among the most spectacular surface to a fleet of new space missions (Mars Express features of the solid bodies of the Solar System.