Hum,
It s also worth quoting the definition of Torino 10 (for future reference)
Quote:
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A collision is certain, capable of causing global climatic catastrophe that may threaten the future of civilization as we know it, whether impacting land or ocean. Such events occur on average once per 100,000 years, or less often
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The probability of an Impact with a asteroid/comet sometime in the future is 100%