Time travel: five ways that we could do it

In 2009 the British physicist Stephen Hawking held a party for time travellers – the twist was he sent out the invites a year later (No guests showed up). Time travel is probably impossible. Even if it were possible, Hawking and others have argued that you could never travel back before the moment your time machine was built.

But travel to the future? That’s a different story.Of course, we are all time travellers as we are swept along in the current of time, from past to future, at a rate of one hour per hour.But, as with a river, the current flows at different speeds in different places.