A new paper by lead-author postdoc Clément Suavet and co-authors, suggests the Moon may have clung to its magnetic field until at least 3.56 billion years ago -- about 160 million years longer than scientists had previously thought. The paper Persistence and origin of the lunar core dynamo is available as an early edition in Proceedings of the National Academy of Sciences.
Clément Suavet is a postdoctoral associate in the Paleomagnetism Laboratory
Suavet, C., B.P. Weiss, W.S. Cassatta, D.L. Shuster, J. Gattacceca, L. Chan, I. Garrick-Bethell, J.W. Head, T.L. Grove, and M.D. Fuller (2013) Persistence and origin of the lunar core dynamo, PNAS published online before print May 6, 2013, doi: 10.1073/pnas.1300341110