The frequency of such events exist on a much larger scale of time than booms and busts. Dangerous solar events seem to happen every 50-100 years, while more cat

The frequency of such events exist on a much larger scale of time than booms and busts. Dangerous solar events seem to happen every 50-100 years, while more catastrophic asteroid events happen every hundreds of thousands of years: http://en.wikipedia.org/wiki/Impact_event#Sizes_and_frequencies http://en.wikipedia.org/wiki/Impact_event#Sizes_and_frequenc...