Physicists believe they may have finally figured out the key to time travel. Here's what you need to know.
Imagine a thread so thin it’s invisible to the naked eye but packed with the mass of thousands of stars. This isn’t science fiction—it’s the theoretical description of cosmic strings, structures that may hold answers to the Universe's greatest mysteries. If confirmed, researchers believe these theoretical strings could unlock the key to time travel. Cosmic strings, if they exist, are thought to be incredibly slender.
Scars, if you will, that were left behind during a cosmic phase transition. They would have formed like cracks that form as water freezes. One of the most tantalizing theories surrounding cosmic strings is their potential role in time travel. BBC reports that Theorist J. Richard Gott discovered that two cosmic strings moving close to light speed could theoretically form a loop in space-time, acting as a wormhole of sorts, which could be the key we need to unlock time travel.
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