Gamma Ray Threats explores the potentially devastating effects of cosmic radiation, particularly gamma-ray bursts (GRBs), on Earth and planetary habitability. It examines the science behind these high-energy events, their origins in stellar phenomena like black hole formation, and the potential for mass extinction should a GRB impact our planet. Intriguingly, geological evidence, such as isotope anomalies found in ancient rock layers, might indicate past radiation events correlated with extinction periods. The book uniquely combines astrophysics, geology, and climatology to assess the risk posed by GRBs.

It begins by explaining the nature of gamma rays and their sources, then details the physics of GRBs and explores geological evidence of past events. The book builds towards a risk assessment, estimating the frequency and severity of future GRB impacts, and concludes with a discussion of potential mitigation strategies and planetary defense mechanisms. This comprehensive approach provides a holistic understanding of a low-probability, high-impact threat to our planet.