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September 1, 2017
3:00pm in PLS 1140
Barbara Cohen from NASA Goddard Space Flight Center
The Violent Early Solar System, as Told by Planetary Sample Geochronology

Abstract: One of the legacies of the samples collected by the Apollo and Luna missions is the link forged between radiometric ages of rocks and the timing of major geologic events, such as impact cratering. Our current understanding of the chronology of the inner solar system is based on the Moon, where evidence suggests that intense bombardment happened during planet formation, followed by a relatively quiescent period, and increased again in an extraordinary bombardment event (“cataclysm”) in the Earth-Moon system at ~3.9 Ga. The importance of the age of lunar samples goes far beyond assigning stratigraphic markers to lunar chronology. The temporal evolution of lunar bombardment is tied to the evolution of a habitable Earth, while the flux of impactors at the Moon drives dynamical models of the formation of the inner solar system. I will discuss how we use the geochronology of lunar and meteorite samples to understand the past history of impact events on the Moon, the Earth, and throughout the solar system.

September 15, 2017
3:00pm in PLS 1140
Michelle Minitti from Planetary Science Institute
September 22, 2017
3:00pm in PLS 1140
Kelsey Young from NASA/Jacobs Technology Inc.
September 29, 2017
3:00pm in PLS 1140
Diane McKnight from NSF
October 13, 2017
3:00pm in PLS 1140
Lina Echeverria from American Management Association, Seven Passions of Innovation, LLC
October 20, 2017
3:00pm in PLS 1140
Emily Martin from Smithsonian Institution
November 3, 2017
3:00pm in PLS 1140
Sarah Johnson from Georgetown University
November 10, 2017
3:00pm in PLS 1140
Hélène Le Mével from DTM/Carnegie Institution for Science
November 17, 2017
3:00pm in PLS 1140
Helen Janiszewski from Columbia University/Carnegie Institution for Science

The coordinator for the Colloquium Series is Dr. Nicholas Schmerr. You can contact him at