The instrument that spots killer asteroids

Astronomers have it rough. Their job is to scan the heavens, looking for something interesting. But often they see the same thing, night after night. After all, stars can burn placidly and essentially unchanged for billions of years. An unlucky astronomer could spend a lifetime turning his or her telescope here and there and, except for the march of the planets and an occasional comet crossing the sky, see nothing new.

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