Infinite ethics is the branch of moral philosophy that studies the ethical implications of living in an infinite universe.

The possibility that the universe is infinite, and that it might therefore contain an infinite number of morally relevant beings, is a challenge to moral theories that instruct us to increase the good in the world. Briefly, the trouble is that in an infinite universe the amount of good may be infinite no matter what we do, and it is difficult to compare infinities.

Cosmologists commonly regard the universe as infinite in their models. However, this is partly for mathematical simplicity, and there is also an alternative hypothesis: It is possible that the universe “curls in on itself,” in the same way that the two-dimensional surface of the Earth does, such that traveling far enough in any one direction would ultimately bring you back to where you started....

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