THE TORINO SCALE "Assessing Asteroid and Comet Impact Hazard Predictions in the 
21st Century" 

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WHITE SHADING: "EVENTS HAVING NO LIKELY CONSEQUENCES" 
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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 that, in the event of a collision, 
is unlikely to reach the Earth's surface intact. 

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GREEN SHADING: "EVENTS MERITING CAREFUL MONITORING" 
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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. 

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YELLOW SHADING: "EVENTS MERITING CONCERN" 
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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 devastation. 

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ORANGE SHADING: "THREATENING EVENTS" 
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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 a global catastrophe. 

7. A close encounter, with an extremely 
significant threat of a collision capable of causing a global catastrophe. 

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RED SHADING: "CERTAIN COLLISIONS" 
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8. A collision capable of causing localized destruction. Such events occur somewhere on Earth 
between once per 50 years and once per 1000 years. 
9. A collision capable of causing 

regional devastation. Such events occur between once per 1000 years and once per 
100,000 years. 

10. A collision capable of causing a global climatic catastrophe. 
Such events occur once per 100,000 years, or less often. 

Meteorite & Info.