Science Fair: How to time travel
There isn’t a proof that time travel exists, and time machines haven’t been invented in real life, but time travel isn’t physically impossible, and finds support in Einstein’s Theory of Relativity.
So, if we want to travel through time, all we have to do is spin around the Earth in a higher speed than the light. Then we would appear there before we left.
Another way of time travelling would be using a wormhole, but not any wormhole would do in this time machine project: it would have to be a traversable wormhole. Then, by using some kind of propulsion, we could accelerate one of the wormhole’s entrances and bring it back, causing a time dilation.
So who knows if we already have visitors from the future, who managed to use relativity, wormholes from other parts of the Universe, or improved the Tipler Cylinder?