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flag NASA warns that thousands of dangerous asteroids remain undetected, and Earth lacks a ready defense system despite progress.

flag NASA warns that around 15,000 medium-sized asteroids, each at least 140 meters wide and capable of devastating cities, remain undetected, posing a significant threat despite progress in planetary defense. flag While the 2022 DART mission proved asteroid deflection is possible, no ready-to-deploy system exists for an actual imminent threat. flag Current detection efforts have only identified about 40% of these objects, with many hidden by darkness or sun glare. flag NASA plans to launch the Near-Earth Object Surveyor space telescope in 2027 to improve detection by sensing heat, but experts stress that funding and preparedness gaps leave Earth vulnerable to sudden impacts.

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