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I dont think likely is needed, splitting apart the Earth without breaching it's GBE is perfectly feasable with 5-C amounts of energy. So anything that reaches 10,000km meteor or whatever is not needed either.Firephoenixearl said:Well since both "shatter" and "extintion" are applicable. We can just settle by votes or "at least, likely". I don't mind either way. The only problem is that anything from a 60miles wide asteroid to the moon. Both would bring extintion without shattering it? Should we just go for the 60miles one?