Alison Gibbings and Massimiliano Vasile, aerospace engineers at the University of Strathclyde, UK, new solution is a 500-kilogram swarm of fingernail-sized spacecraft would, they calculate, deflect a ...

Among existential threats to humanity, asteroid impacts rank high — in part because they’ve caused extinction-level events on Earth so many times before. Indeed, the dinosaurs perished 66 million ...