Parallel Universe

The idea of parallel worlds may seem to be pure fantasy but for many scientists it is much more than science fiction. Einstein's theory posited that each 'black hole' would be symmetrical with another gravitational well called a 'white hole' or sometimes called a 'white fountain'. The black / white hole pair would form a worm hole or vortex. Any matter swallowed up in the black hole would be quickly spat out by the white hole in an unknown location. This could be either a distant point in the universe , in which case the worm hole would act as a shortcut through space and time. Alternatively, it could be in a parallel universe; in which case it would act as a bridge between the different dimensions.

Sadly we are not yet able to cross these bridges; it would take a tremendous amount of energy to open a wormhole artificially; and the gravitational force inside it would be so strong we would be crushed.

Those who believe in time travel may rely on the existence of parallel universes which would allow for the resolution of the “Grandfather Paradox”

“If a man were to go back in time and kill his grandfather as a child, logically speaking, he would not be born since his father before him would not be born.

If he wasn't born then he can't go back and kill his grandfather, therefore his grandfather lives and the grandson is eventually born, therefore he can kill his grandfather and so on.........”

If you consider that wormholes are short cuts through the space-time continuum, the man could use on to go and kill his grandfather. However, he would arrive not in a point of his own universe, but instead, in a parallel universe, in which his existence doesn't depend on the continued existence of his father. In killing this version of his grandfather he would be preventing the birth of his father and hence the birth of his double in the parallel universe.