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NASA's top expert on near-Earth objects says that new telescope systems, including a "last alert" system that's just now being set up, are gradually getting a handle on potentially threatening asteroids. But comets? That's a completely different story.

"We can do something about asteroids. Comets are a problem," said Donald Yeomans, the head of the Near-Earth Object Program at NASA's Jet Propulsion Laboratory in Pasadena, Calif.