[[Image:BirthsForOmega.JPG|right|frame|Figure A: The probability of reaching One Trillion people from the current (60 billion) count under the SIA, against different theoretical maxima for "N". (The x-axis is the finite maximum number of people that "can" ever be born into the universe - the upper limit of "N" - plotted on a log scale.) Note that the carrying capacity is the maximum number of people in any potential universe, not just this one, but even on Earth the maximum number of people that sunlight can simultaneously support has been estimated (e.g. by Isaac Asimov) at over a trillion; extending this for a million generations gives an upper limit over a quintillion on just this planet, and a septillion if humanity colonizes fewer than 0.001% of the galaxy's stars with similar efficiency. Under the SIA, as the potential size of "N" increases, the significance of the current number of births ("n") decreases, to the point that this posterior information does not constrain the actual value of "N" at all.