They didnt - there is no parallel universe.

There is no evidence that Parallel Universe exists, but doesn't mean that it doesn't exist. Accord of the law of Physics, yes Parallel Universe can exist. However if Parallel universe does exist, it will benefit to because when our universe come to an end, the only way to survive is to escape our universe to parallel universe.

a parallel universe is where there is a different universe that is completely opposite; so if you make a decision that person in the parallel universe will do the opposite. Even very little things could change what happens in the parallel universe- such as what you wear or what you eat for breakfast.

a parallel universe is where there is a different universe that is completely opposite; so if you make a decision that person in the parallel universe will do the opposite. Even very little things could change what happens in the parallel universe- such as what you wear or what you eat for breakfast.

If there is such a thing as a parallel universe, and if it's not already

located near and parallel to our universe, and if it's located in some

other place, and if our universe and the parallel one are moving toward

each other, and if there's such a thing as them meeting each other, then

nobody has any idea what would happen in that event.