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And Now, the Asteroid Forecast ...

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Science  30 Jul 1999:
Vol. 285, Issue 5428, pp. 655
DOI: 10.1126/science.285.5428.655

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Summary

Astronomers have devised a scale to rate the danger posed by asteroids headed for Earth, comparable to the Richter scale of earthquake fame. The so-called Torino scale, which ranges from 0 (no collision) to 10 (certain collision causing Earth-wide devastation), was endorsed last week by the International Astronomical Union.