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  clickbait: 'The 'cosmic endowment' consists of all the stars that could be reached from probes originating on Earth; the sum of all matter and energy potentially available to be transformed into life and fun.',
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  text: 'The 'cosmic endowment' comprises the $\\approx 4 \\times 10^{20}$ estimated stars that could potentially be reached by probes originating from modern Earth, before the expanding universe carries those stars over the [cosmological horizon](https://en.wikipedia.org/wiki/Hubble_volume).  It has been [estimated](https://www.gwern.net/docs/ai/1999-bradbury-matrioshkabrains.pdf) that simply surrounding a star with solar panels would yield on the order of enough energy to perform $\\approx 10^{42}$ computer operations per second.  Using 100 billion neurons x 1000 synapses per neuron x 100 operations per synapse per second as a standard handwavy estimate of the computing power required to support a human-equivalent existence--although it is doubtful that humans are using this computational power very efficiently, or that 100 ops/second could faithfully simulate one synapse--this suggests that a star could support, at minimum, $\\approx 10^{25}$ human-equivalent sapient lives.  Glossing a star's lifetime as 1 billion years, and assuming the quality of posthuman existence to count for no more than 1 Quality-Adjusted Life Year (QALY), this suggests that the cosmic endowment could be used (extreme handwaving) to realize *at least* $\\approx 10^{54}$ QALYs.',
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