A lecture by Jeremy Stone, former president of Federation of American Scientists (FAS).
This talk responded to a request from the leader of an on-going lecture series at La Costa Glen on astronomy who wanted to know more about the work of Professor Richard Muller at the University of California, Berkeley whose astounding theory of a second star in the Solar System was summarized in the famous book Nemesis: The Death Star—The Story of a Scientific Revolution.
Drawing on the material in this book and on two related books by David M. Raup (The Nemesis Affair and Extinction), the lecture makes the case for periodic extinctions of life caused by comet impact every 26,000,000 years with a few lucky exceptions. The comet impact is caused by a small star, Nemesis, which orbits the Sun with a 26,000,000 year periodicity and brings, in its trail, a rain of comets, some of which arrive in the inner solar system and one or more of which hit the Earth.
This lecture was given on July 16, 2011.