N
newtonian
Guest
It seems that many cite dangers to earth as reasons to populate space - notably, for example, earth's future entering solar heating leading up to red giant phase.<br /><br />I do not consider that a reason to leave - see my thread on this.<br /><br />[Note: the Biblical model, which I believe, solves all of these problems, including overpopulation - a tangent I will post on eventually.]<br /><br />For a time during the 20th century earth's population doubled in 35 years.<br /><br />Assuming this rate for 5 billion years, what will earth's population be?<br /><br />Here goes - please correct me if I am wrong:<br /><br />Assume only 10 million stay behind on earth. [Many models, e.g.: all others go to populate space; the Biblical model: all others destroyed at Armageddon.]<br /><br />Now the math, simplified: [doubling every 35 years]<br /><br />Earth's population Years from now<br /><br />10 million<br />20 milllion in 35 years<br />40 m 70 yrs<br />80m - 105yr<br />160m - 140 yr<br />320 175<br />640/210<br />1280/245<br />2560/280<br />5120/315<br />10,240/350<br /><br />Ok, now to simplify: instead of 10 billion 240 million in 350 years, we will round down to exactly 10 billion.<br /><br />That means adding 3 zeros, 3 powers of ten, each 350 years.<br /><br />350 years - 10 billion population<br />700 yr - 10 trillion<br />1050 - 10 quadrillion.<br /><br />Now, simplify again. Round down to 1,000 years instead of 1050 years. Therefore 10 quadrillion population in 1,000 years. Or, add 9 zeros (= 9 powers of 10) each 1,000 years.<br /><br />Simplifying again, add 90 zeros every 10,000 years.<br /><br />Add 900 zeros in 100,000 years.<br />9,000 zeros in 1 million years.<br />900,000 zeros in 1 billion years<br />4,500,000 zeros in 5 billion years.<br /><br />Hence earth's population in 5 billion years will be 10^4,500,000.<br /><br />That's 1 followed by 4,500,000 zeros.<br /><br />What did I do wrong? I tho