Abstract
Since our technological civilisation depends on our planet's properties, anthropic selection can explain the close match between the high 26Al/ 27Al ratios in the earliest Solar System solids, which are difficult to produce in models of star-formation, and the limiting value required to cause (the widely observed) thermal processing of planetesimals. We suggest that volatile loss on heating of planetesimals favours future development of technological civilisations in Solar Systems with elevated concentrations of 26Al.
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