Anthropic reasoning works best if there’s a multiverse, a cosmos made up of many universes. Perhaps some spring from black holes in other universes, for example, or perhaps there is a sequence of universes arising after successive Big Bangs. Some cosmologists hold that the laws of the universe are partly determined by what happens just after the Big Bang, so the laws may vary from one universe to another within the multiverse. If there are enough universes with varying laws, it’s highly likely that one or more of them will contain life and observers. If so, it’s no surprise to find ourselves
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