Astronomical waste is the loss of potential value from delaying the efficient exploitation of the universe's resources. The term and the concept expressed by it were introduced by Nick Bostrom in a seminal paper.^[1]

The accessible universe is vast, and virtually all of it remains unexploited. The Virgo Supercluster contains $10^{13}$ stars, and the energy of each star could power $10^{42}$ computations per second. The human brain can perform about $10^{17}$ computations per second. Assuming that the morally relevant properties of the brain—such as phenomenal consciousness—supervene on its functional organization, it follows that the universe could support, every second, an amount of value equivalent to that realized in $10^{13} \times 10^{42} \div 10^{17} = 10^{28}$ human lives. The moral costs of failing to actualize this potential thus appear to be enormous.

In relative terms, however, the costs may be pretty modest. The cosmos has existed for about 10 billion years, so one should not antecedently expect cosmological processes to cause value to decay by more than 1 part in 10 billion or so per year. And the observational evidence appears to be consistent with this prior assessment. The finitude, expansion, and burndown of the universe seem all to be occurring at a slow enough rate to be in line with the estimate based on the duration of the universe so far.^[2]

If the opportunity costs of delaying the exploitation of the universe's resources are so small in relative terms, however large they may be in absolute terms, it follows that such costs are unimportant relative to the costs arising from exposure to existential risk, which are much higher in comparison. Over the next decade, maybe a billionth of total attainable value will be lost due to failure to arrange the universe optimally. Over that same decade, perhaps a thousandth of this value will be lost in expectation from exposure to a 0.1 percent risk of an existential catastrophe. The costs from existential risk exposure thus appear to exceed the opportunity costs from delayed expansion by several orders of magnitude.

Thus, although upon first noticing the astronomical costs of delayed technological development an altruist may be tempted to conclude that such development should be hastened, that conclusion does not survive careful reflection. Because anthropogenic existential risks from new technologies pose ...

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