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Near-Earth Objects Asteroids Risk Assessment Impact Events Impact Risk Assessment NASA Impact Risk Impact Mitigation NASA Missions Monitoring Systems Asteroid Detection Detection Methods Asteroid Redirection Comets Asteroid Deflection Space Missions Impact Hazards Monitoring Asteroids International Collaboration Asteroid Monitoring Tracking Objects Observation Techniques Mitigation Strategies Collision Risk Assessment Monitoring Space Safety Mission Planning Future Missions Public Misconceptions Celestial Object Tracking Space Agencies Destruction Methods Observational Techniques Impact Hazard Assessment Asteroid Mining Space Exploration Detection Asteroid Impact Missions Hazardous Asteroids Monitoring and Detection Detection Systems Asteroid Impact Mitigation ESA's Activities NEO Threat Assessment Radar Observations Asteroid Impacts Impact Studies Kinetic Impact Techniques Asteroid Studies Impact Threats NASA Research Deflection Techniques International Cooperation Impact Risk Management Monitoring Techniques Impact Predictions Asteroid Mitigation Collisional Hazards Asteroid Impact Impact Probability Collision Course Space Objects NEO Surveyor ESA