Asteroids Risk Assessment Near-Earth Objects Impact Mitigation Impact Events Impact Risk Assessment NASA Missions NASA Asteroid Redirection Asteroid Monitoring Monitoring Systems Detection Methods Tracking Objects Impact Threats NASA Research Monitoring Asteroids Deflection Techniques International Cooperation Impact Risk Management Monitoring Techniques International Collaboration Mitigation Strategies Observation Techniques Impact Predictions Asteroid Mitigation Celestial Object Tracking Asteroid Impact ESA's Activities NEO Threat Assessment Radar Observations Asteroid Impacts Asteroid Deflection Asteroid Detection Impact Studies Space Missions Impact Risk Kinetic Impact Techniques