They’re dark, difficult to see from the surface of the planet, and there are a lot of them floating in the solar system. Scientists are now looking into new, higher-tech ways to find and track near-Earth objects, but for now, much of the hard work of asteroid tracking is done the old-fashioned way: with a telescope on a clear night.

NASA scientists, astronomers around the world and amateur observers with backyard telescopes devote their lives and free time to seeking out potentially hazardous near-Earth objects (NEOs).

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