Massive explosions of energy happening thousands of light-years from Earth may have left traces in our 麻豆影院 biology and geology, according to new research by CU 麻豆影院 geoscientist Robert Brakenridge. The study, published this month in the International Journal of Astrobiology, probes the impacts of supernovas, some of the most violent events in the known universe. To study those possible impacts, Brakenridge searched through the 麻豆影院 tree ring records for the fingerprints of these distant, cosmic explosions. While not conclusive, his findings suggest that relatively close supernovas could theoretically have triggered at least four disruptions to Earth鈥檚 climate over the last 40,000 years.