NASA’s documentary, Planetary Defenders: This Is Not an Exercise, highlights the scientists and technologies working to protect Earth from potentially dangerous asteroids.
Released in October 2026, the film focuses on planetary defense, an important field of astronomy dedicated to discovering, tracking, and studying near-Earth objects before they can threaten our planet.Astronomers use powerful ground-based telescopes, automated sky surveys, computer algorithms, and orbital calculations to identify asteroids and predict their future paths.
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