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NASA's Planetary Defense Coordination Office is open for business. Its mission is to look out for asteroids and comets coming too close to our planet. And if Dr. Kelly Fast and her colleagues detect a potentially hazardous object, they have to come up with a response. (Picture: The Panoramic Survey Telescope & Rapid Response System (Pan-STARRS) 1 telescope on Maui's Mount Haleakala, Hawaii has produced the most near-Earth object discoveries of the NASA-funded NEO surveys in 2015; Credit: University of Hawaii Institute for Astronomy / Rob Ratkowski)