We Need a Good Asteroid Detector
The odds are good that eventually our planet will be hit by an asteroid or a comet, as it has many times before. Engineers and scientists here at NASA?s Langley Research Center are trying to spot these hazards before they sit. One good place to set up an astronomical alarm system is on the Moon.
A large number of asteroids larger than a half-mile across are in orbits that bring them close to Earth. If any of them were to hit our planet, it would cause social and environmental upheaval. Locating the whereabouts of these objects is the major job of several Earth-based telescopic searches.
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