See what you think . REMEMBER - Just a bit of fun, does not need constructive critiscism just your opinion .
Below: Marty McFly with the Flux Capacitor.
As for the physics and theories... this isnt some smartass A-level student. I am 14. When i thought this up i was 11. I have deliberately kept it unchanged. Keep it in mind as you look.
Step 1: The theory - what i can't prove.
Imagine a void, something like the concept of the space-time vortex in Dr. Who. A place outisde space and time. It would be a tube shape but would be cyclical - keep going round . So a doughnut shape. Ever heard the old time-travel theorey? Get a black hole, bend it in a doughnut , put a tube in the middle and run down at the speed of light? Well this also uses doughnuts - the shape concentrates forces in the centre. In my theorey, these concentrated forces made the univeres inside and around it, especially inside. The idea is that you can go from place/time to place/time by going into the void, going to a 'window' (the other side of the void) to another part of reality and then break out again. There is no matter or antimatter in the void. But you/matter is attracted to othermatter/the universe , so... getting out is easy. Getting in ... hard. To do so you must break a hole in the wall of the void, a hole in space and time. As the matter and nothingness repell the leak seals instantly after.
Below : Picture of black hole with something that scientists have noticed but don't know what it is around it.
Now to break a hole in spacetime you will need 2 things. To go very fast, nearing the speed of light where time starts to bend. And to react matter with antimatter. Now 2 problems occur . Man has never gone so fast and there is no antimatter around - it instantly reacts with matter. You can't make a container for it - it will react with the matter of the container. So you have to make the antimatter yourself.
To solve the problems of breaking through spacetime see the next step.