>>33978832Technically you can square our current universe into infinite boxes. You can then label each box a sub-universe, which is essentially just a universe with a boundary. Since the universe is infinite, you'll have infinite boxes.
For practical purposes, our universe is effectively 46 billion light-years in radius, as that is the extent of the observable universe. Anything outside that range has no effect on us. Effectively we are in our own natural sub universe. Then we can go from "box" to "box" of universes of 46 billion light year radius that have no interaction with ours and label them separate universes.
Since the universe is infinite, with each sub-universe it becomes exceedingly likely there is not just one but infinite sub-universes almost exactly like ours.
Therefore, even within our own universe, there are solar systems nearly exactly like ours, with humans coincidentally evolved nearly exactly like us, doing nearly the exactly same thing we're doing.
