Inside our observable Universe, there’s just one Earth and one “you.” However in an unlimited multiverse, a lot extra turns into doable.
Right here in our Universe as we all know it, as soon as an end result has occurred, there’s no going again. When you open a bag of potato chips, you may by no means return that bag to its unopened state; the air molecules from inside and outdoors have already combined with each other, even when you reseal it. As soon as you narrow down a tree, you may by no means return the tree to the state it was in previous to you slicing it down. Even on a quantum stage, when you measure a particle’s spin, you may by no means return it to its pre-measurement state. We have now solely the one Universe that we inhabit, and whereas future occasions don’t but have determinate outcomes, previous occasions all do.
However what if there have been copies of our Universe on the market, far past the boundaries of what’s observable or measurable, that have been an identical to our personal? Would it not be doable for various outcomes to have occurred in these Universes, and what would that imply for a wide range of techniques: quantum particles, bushes and potato chip luggage, and even complete human beings? That’s what Danny Porter desires to know, writing in to ask:
“If the universe is infinite, and string principle suggests…
