Wormholes

They can also be used not only to travel through time, they can be used to travel through space. If we imagine the universe to be on a flat plane, and matter (such as planets) to be objects suspended on that plane, then hypothetically, it could be possible to bend the plane such that they are parallel to each other and a "hole" or tunnel can be created that allows the passage from one plane to the other. Thus, it will allow people to travel from one point in space to another point almost instantaneously.