It seems that scientists find more and more evidence to prove the existence of parallel worlds. Physicists at Stanford University managed to calculate the hypothetical number of universes that were formed as a result of the Big Bang. According to them, the Big Bang created 10¹⁰¹⁶ universes. It is quite possible, though, that they may exist inside one another, including our planet. Therefore, there is probably another Earth hidden inside planet Earth.

The hollow Earth theory can be traced back to ancient periods of the history of human civilization. Ancient wise men believed that there was a whole underground world with its underground creatures living inside the planet. It may seem to many that it is only a primeval and naïve perception of the structure of the world.

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