The Pluralism of Worlds and Other Yous
THE PLURALISM OF WORLDS AND ANOTHER YOU, AND ANOTHER YOU, YOU, YOU ...
Space has been measured to be flat (stretched) in all directions and Hubble's law shows it expands at superluminal velocity.
This means that space appears to be infinite. Now, given that matter only has a FINITE number of ways it could assemble itself given the laws of physics, it is only logical that the following is most likely true:
Travel far enough into space, beyond our observable universe---talking a gazillion parsecs of cosmic distance---and don't be surprised to find another Earth, with another you, where physics class is the same, but history class differs a little (perhaps Nazi Germany won), and everybody speaks an alien language despite being, pretty much a clone of everybody on this planet ...
Travel another unimaginable googleplex, in another cosmic region, and the entire Milky Way analogue is found. There is yet another Earth which, by chance, is exactly the same as our home planet: another you speaking English, with Internet access on another Facebook, reading a post like this from another version of me; and the entire history of that planet is the same as ours. It is also called 'Earth'.
Your limited human intuition might find this counterintuitive, or CRAZY, even. But think again. It is actually not just mathematically plausible, it is logical. These are the philosophical implications of a vast-enough space in existence.
Crazy would be to assume our tiny speck of a world is completely original and unique amidst an infinity ...