Planetary Defense: Teamwork
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NASA is on a mission to find all natural impact hazards to Earth and and determine a plan of action. To pose a threat, hazardous objects must be large enough and close enough to Earth. NASA detects and watches these objects with the help of observers across the globe, including both professional and amateur astronomers. NASA has successfully detected, tracked, and cataloged most of the largest near-Earth objects. NASA is working now on finding smaller objects to defend the planet against potential impact. NNSA is one of the Federal agencies with responsibilities for “planetary defense” or detecting and mitigating impact threats from potentially hazardous near-Earth objects, such as asteroids and comets. These efforts are part of an official national security focus for the United States.