The wild physics that could actually be used to build a time machine

From warp drives to quantum tricks, here are five ways that physicists have figured out how to theoretically travel back in time

OK, yes, I will almost certainly regret starting this article with such a hoary old joke. At some point, most of us have wished we could travel back in time to repair some misstep or faux pas. But it’s impossible, right?. We know that matter can bend space-time, and if you bend it enough, you may be able to create a time loop. Caveats abound, of course, and researchers are yet to announce a working time machine. But that hasn’t put them off exploring the possibilities.

Here are five ways that time travel might just be feasible, from science fiction staples to surprising new ideas – as well as some pesky practical obstacles we would need to overcome.The main problem with time travel is that nothing can travel faster than the speed of light, which clocks in at 299,792,458 metres per second. This speed limit preserves causality, the idea that cause must always come before effect.

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