Multiverse

The multiverse could exist in many ways, and this one exists in a simple way-different universes vibrate at different frequencies so none would notice another, meaning that our Earth, the center of the galaxy, could vibrate at a frequency of x, and another Earth, could vibrate at a frequency of y.

The Multiversal Big Bang
It all began with the Big Bang, a sudden release of matter and energy, including their dark forms.

The Multiverse started to cool after a few seconds, and due to Quantum Mechanics, all possible frequencies were created and led to the seperate universes being, well, seperate.

Parallel Universes
Among these Parallel universes, which are infinite, there are a few ones more important than others.

-Earth 1 (us) This is the center of the Multiverse, with our parallels orbiting us. However, if something were to destroy this Earth, this could potentially lead to a multiversal collapse of universes and lead to their destruction.

-Earth 2 (closest Earth to E-1) This Earth is involved in a few crisises as well, like our Earth. It is the Earth most similar to ours in almost every single aspect, including our Gods, creatures and history.

-Earth 6,8,12,14,22,39 and 45 are all the current known 'Dead Earths', destroyed by wars, plague or other factors resulting in their destruction.