Most Potential City-Killer Asteroids Lurk Undiscovered Near

NASA, the European Space Agency (ESA) and others have for decades aimed to discover and catalog all the near-Earth asteroids (NEAs) that pose an existential threat.

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Russia , Chelyabinsk , Chelyabinskaya Oblast , Seth Jacobson , Michigan State University , European Space Agency , Tunguska River , Nasa , Planetary Defense Coordination Office , Earth , Aeneas ,