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Asteroid-Comet Destruction Scale
The Info Service Chart & Reference Guide
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Scale Potential
0 The likelihood of a collision is zero, or well below the chance that a random object of the same size will strike the earth within the next few decades. This designation also applies to any small object to reach the earth's surface intact.
1 The chance of collision is extremely unlikely, about the same as a random object of the same size striking the earth within the next few decades.
2 A somewhat close, but not unusual, encounter. Collision is very unlikely.
3 A close encounter, with 1% or greater chance of a collision capable of causing localized destruction.
4 A close encounter, with 1% or greater chance of a collision capable of causing regional destruction.
5 A close encounter, with a significant threat of a collision capable of causing regional devastation.
6 A close encounter, with a significant threat of a collision capable of causing global catastrophe.
7 A close encounter, with an extremely significant threat of a collision capable of causing global catastrophe.
8 A collision capable of causing localized destruction. Such events occur somewhere on earth between once per 50 years and once per 1,000 years.
9 A collision capable of causing regional destruction. Such events occur between once per 1,000 years and once per 100,000 years.
10 A collision capable of causing a global climatic catastrophe. Such events occur between once per 100,000 years or less often.

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