Time travel is a theme regularly explored in science fiction. The film, 'Back to the Future' made millions aware of the space-bending properties of physics, and popularised the theory forever. Yet, the framework for such a feat already existed and could be found within Albert Einstein's theory of special relativity, written in 1905.
With it came an almost endless list of captivating and futuristic ideas like time travel, wormholes and blackholes.
Wormholes, or Einstein–Rosen bridges, captured the imagination of scientists around the world as they offered a "cosmic shortcut" - a tunnel through the fabric of space and time.
Hopping through one would be incredibly difficult, scientists say.
But they have yet to rule it out, with many suggesting the creation of one might be possible in the future.
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Brian Cox: The physicist said wormholes are likely impossible to create (Image: GETTY/Youtube/PowerfulJRE)
Back to the Future: The DeLorean in the classic film could travel through time (Image: Youtube/Universal Pictures)
Professor Brian Cox, the physicist, appeared to put an end to the debate however when discussed the topic on the 'PowerfulJRE' podcast in 2019.
He explained how wormholes were plausible in theory, yet could not exist in nature because the properties necessary to create them do not exist.
Prof Cox said: "With a wormhole you could go all the way around the edge or you could go through the shortcut.
"You can do that in Einstein's theory, you can go right down through the geometry.
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Physics: Cox has popularised science and theoretical ideas like time travel and blackholes (Image: GETTY)
"But the first question is: Can you make it? And as has been explained, we don't think the properties to make the wormhole exist.
"The second set of bits of theoretical works are, if you had a wormhole, then what would happen if you tried to travel through it?
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