I heard the first term in the movie, ‘The One’. I found it as cool as space and time warp.

Here’s a theory I got from this page.

According to Michio Kaku,
For years parallel universes were a staple of the Twilight Zone. Science fiction writers loved to speculate on the possible other universes which might exist. In one, they said, Elvis Presley might still be alive or in another the British Empire might still be going strong. Serious scientists dismissed all this speculation as absurd. But now it seems the speculation wasn’t absurd enough. Parallel universes really do exist and they are much stranger than even the science fiction writers dared to imagine.

But even though it will be proven. How would we switch to our parallel universes? Space suit, escape velocity, vacuum and other scientific considerations are needed. So if we try to fly unprotected through the space, these are things that will happen?

According to Henry Spencer,
Various minor problems (sunburn, possibly “the bends”, certainly some [mild, reversible, painless] swelling of skin and underlying tissue) start after 10 seconds or so. At some point you lose consciousness from lack of oxygen. Injuries accumulate. After perhaps one or two minutes you’re dying. The limits are not really known.

You would probably pass out in around 15 seconds because your lungs are now exchanging oxygen out of the blood. The reason that a human does not burst is that our skin has some strength. For instance compressed oxygen in a steel tank may be at several hundreds times the pressure of the air outside and the strength of the steel keeps the cylinder from breaking. Although our skin is not steel, it still is strong enough to keep our bodies from bursting in space.