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Which means they are subject to a sort of cube law.This means if the Note: the above equations are based upon the work of Jill Tarter and Margaret Turnbull.If all the planets range from miserable hell-holes to utterly uninhabitable you have roughly five options: The divergence of human exocivilizations both from terrestrial civilization and from each other will be in evidence to the careful observer early on in their development.While living on Mars will not be easy, it will be far more planet-like than living in an entirely artificial habitat.
In his Flandry of Terra novels, Poul Anderson specified that the Terran Empire was four hundred light years in diameter. A sphere 400 light years in diameter has a 200 light year radius. Anderson cites a figure of about four million stars, which means one of us is a bit off the mark Why, I shall tell you what we are and these are, John Ridenour.
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