Dark Matter as a Trigger for Periodic Comet Impacts
Professors Lisa Randall and Matthew Reece suggest that a smooth disc of dark matter passing through the Galaxy approximately every 35 million years might be the underlying cause of the cycles of increased meteorite activity on Earth, such as the one that led to the extinction of the dinosaurs. See: E. Gibney, "Did dark matter kill the dinosaurs?" Nature News () | doi:10.1038/nature.2014.14839. Also read: L. Randall and M. Reece, "Dark Matter as a Trigger for Periodic Comet Impacts," arXiv:1403.0576v1 [astro-ph.GA] 3 Mar 2014. This paper will be published in an upcoming issue of Physical Review Letters.