Trent Shipley wrote: > > > Ok. But it's better to go back and set the Drake factors based on what > > we want to get in the end. > > Excellent idea! > And then we can get back and estimate how many planets developed pre-sentient life _before_ the Progenitors came and destroyed their own planets causing self-extinction, based on the estimation that the Universe is some tens of thousands of millions of years old and that Galaxies might have existed from half to 1/10 of this time.
> N* = 100*10^9 (that is, 1.00E+11) > fp = .75 (most systems have planets) > ne = .25 (few could support life, partly a cheat factor) > fl = 3.00E-05 (3/100,000 have life, entirely a cheat factor. Implies there > are a lot of terraforming candidates....) > fi = 1 (ALL good planets get colonized) > fc = 1 (If colonized, the setlers participate in O-2 Civ.) > fL = .125 (7 times out of 8 a planet is fallow) > > This gives the number of planets that could *naturally* support life in the > Milky Way > > N = 7.03E+04 > Small, isn't it? > 5 galaxies > > Total natural planets under GIM control = 2.81E+06 > > Total natural GIM leased planets = 5N = 3.52E+05 > > Natural/Terraformed = 1/6 > > Total GIM planets (B or C leasable) = 1.69E+07 > > (We don't count A class leases because they are in need of terraforming.) > > Total GIM B or C leases at present time = 2.11E+06 > > Giving us about 11.1 planets per race, which is close enough to 10. > Yes, I think the mean of 10 is consistent with the data that Earth has 10 Alberto Monteiro _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
