Hi again, Dave Freeman was kind enough to e-mail me about a point of confusion in my prior post. I didn't pay close enough attention to Robert Beauford's last question:
> An object over 1 kilo (2.2 lbs) might fall in a given 1 square > mile piece of land only once in every (how many) years? I mistakenly answered the related question "An object over 1 kilo might fall on a ? square mile piece of land once per year" (following the example of the prior question). I based my answer on a WAG (wild ass guess) at the ratio of falls producing 10-gram meteorites to falls producing 1-kilogram meteorites (20 to 1). So, given my earlier answer that one 10-gram meteorite per year falls on a 5000-square-mile plot of land, this is equivalent to saying on average that one 10-gram meteorite falls every 5000 years on a 1-square-mile plot of land. Assuming that 20:1 ratio kilo-to-10-gram ratio was correct, that would mean you'd need to wait 100,000 years on average for a 1 kilo meteorite to land in a given 1 square mile area. However, these numbers are all based on *falls* per unit time, not meteorites per unit time. Since each fall usually produces a number of meteorites (sometimes thousands or even tens of thousands!), this changes the statistics on numbers of non- unique 10-gram or 1-kilo meteorites per given area. To really solve the problem, you'd need to know more about the statistics of strewnfield areas, and average numbers of 10+ gram and 1+ kilo meteorites dropped per fall. Best, Rob ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
