Threats from space aren’t limited to extraterrestrial life forms. Celestial rockfall can do damage on a global scale — and it already has. From the KT Event 65 million years ago that wiped out the dinosaurs, to the Tunguska Event in 1908 Siberia that felled 80 million trees, cosmic collisions have apocalyptic aftermaths. Luckily for us, systems are being developed to protect our planet — whether from massive stray asteroids, or supercharged solar winds. 
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