NASA’s Planetary Defense System called DART had successfully altered the course of an asteroid—the first time in history that humanity has changed the direction of a celestial body. Last month the $330m satellite crashed into Dimorphos, a 160-metre-wide space rock, at 14,000mph (22,000km/h). It was the first test of NASA’s planetary defence system, which is designed to prevent asteroids colliding with, and potentially destroying, Earth. (Economist)
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