Is it possible that there are alternate universes where earth exists and we exist ?
It’s totally possible. Not necessarily probable, but possible. If so, then there are countless other universes, and this is just the beginning of how weird it gets, but there is a “you” in many of them, and there isn’t a “you” in most of them. But many of them there is a sort-of you. Like for example, there would be one where your parents gave birth to a child on the same day as you, but gave it a different name, and maybe it doesn’t really even look like you. Or maybe your parents gave birth to a girl a few days before or after your birth date. How much different does a parallel “you” have to be, before you don’t consider it “you” anymore? The origin of this idea is also really weird and is based on quantum physics. Put in very simple terms, tiny tiny particles called quanta have specific states that define them, but until you observe the particle, it can exist in a vague, undetermined state, or in several states at the same time (called a superposition). When you observe it, it “choo