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Science 30 July 1999:
Vol. 285. no. 5428, p. 655
DOI: 10.1126/science.285.5428.655
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News Focus

IMPACT HAZARDS:
And Now, the Asteroid Forecast ...

Govert Schilling

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)