How It Works is the action-packed magazine that's bursting with exciting information about the latest advances in science and technology, featuring everything you need to know about how the world around you - and the universe - works. ![]() This article is brought to you by How It Works. Trajectories in space-time that loop back into the past are given the technical name "closed timelike curves." If you search through serious academic journals, you'll find plenty of references to them - far more than you'll find to "time travel." But in effect, that's exactly what closed timelike curves are all about - time travel And because we're talking about space-time, not just space, the wormhole's exit could be at an earlier time than its entrance that means you would end up in the past rather than the future. That's because the black hole's gravity would tear you to pieces as you approached it, but it really is possible in theory. Unfortunately, it's not as practical a means of transport as Hollywood makes it look. You enter one black hole, and emerge from another one somewhere else. ![]() ![]() In effect, a wormhole is a shortcut from one point in space-time to another. The result is a so-called wormhole, a concept that's familiar from sci-fi movies, but actually originates in Einstein's theory of relativity. (Image credit: USAF)īut for more dramatic effects, we need to look at much stronger gravitational fields, such as those around black holes, which can distort space-time so much that it folds back on itself.
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