After reading everyone’s explanations of parallel universes, I still have a lot of doubts. I feel that this theory can only be used to explain the inexplicable time-traveling paradox.
1. Since it is a parallel universe, how can you know if there is a universe ABC? Did you travel to Universe A, Universe B, or Universe C?
2. If the travel time is controllable, then we can create countless parallel universes: Student M travels through universe A to kill himself in the past. According to the grandfather paradox, it is impossible to happen, but with the parallel universe theory, This can happen because M creates a new parallel universe B, and then 2 seconds later, M returns to the parallel universe B 1 second ago, killing itself, according to the theory of parallel universes, M will create again A new parallel universe C...
So, this is how countless parallel universes are formed.
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