Travelling through time may not be a fantasy explored solely in the world of science fiction as most theoretical physicists agree that it is possible.
But while we all know that we can move forward in time (it’s happening right now), most experts agree that it is not possible to move backwards and visit the past.
Theoretical physicists such as Professor Steve Hawking and Professor Brian Cox believe that travelling at the speed of light could propel humans into the future.
This is based on the Albert Einstein's Theory of Special Relatively, published in 1905, in which an object moving at the speed of light would experience time slowing down.
This would mean that while the person moving fast would see their clock slowing down, time would stay the same for people who were moving normally.
The most obvious problem with this theory is figuring out how to propel a human at the speed of light without killing them.
The boffins at CERN in Switzerland have propelled tiny particles at the speed of light using the Large Hadron Collider – but are a long way off strapping humans into a similar kind of machine.
Another theory is using wormholes to transport humans from one point in space to another instantly.
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