If spacetime goes on forever, and there exists a finite number of ways particles can be arranged in space and time, at some point it has to start repeating. If this is the case, infinite versions of ourselves exist. Another version of you, he/she might be reading another version of this webpage or could be on a completely different path in life. If our universe is roughly 13 billion years old, the observable universe extends roughly 13 billion lightyears. Beyond that distance, a separate universe and beyond the observable spacetime of that universe, a separate universe and beyond that.......