Scientists have identified 11-million-year-old glass fragments in South Australia that record a massive asteroid impact never before known. Despite the event’s magnitude, the crater remains undiscovered, raising new questions about how often large asteroids have struck Earth and their role in shaping its surface.Scientists have identified 11-million-year-old glass fragments in South Australia that record a massive asteroid impact never before known. Despite the event’s magnitude, the crater remains undiscovered, raising new questions about how often large asteroids have struck Earth and their role in shaping its surface.