What I don't understand is from this site:
http://neo.jpl.nasa.gov/torino_scale.html
Level 8
Quote:
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A collision is certain, capable of causing localized destruction for an impact over land or possibly a tsunami if close offshore. Such events occur on average between once per 50 years and once per several 1000 years.
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but then on the other link posted in the thread, for the next hundred years it shows only the maximum on the Torino scale as 1.
Seems a bit off if you ask me...