With the discovery of cosmic rays that constantly irradiate the earth, the protective role of the earth's atmosphere and magnetic field is now recognized as crucial preservation of biological life. If we move beyond the atmosphere to explore interstellar space, this protection is removed. In his talk, David Galbraith explores the sterilizing effects of cosmic radiation. We are left with the conclusion that preservation of our planet, Planet A, is the only recourse for the survival of humanity, and that "There is no Planet B".
This talk was presented to a local audience at TEDxUofA, an independent event.