Wormhole theory
Wormholes were first mentioned by Albert Einstein in his theory of general relativity, linking to the possible existence of white holes and them being direct exits of black holes, connecting to points in space.
In 1935, Einstein
and another physicist Nathan Rosen expanded on the idea, and proposed existence
of “bridges” connecting two points through space-time, that could theoretically
be used as shortcuts in space travel. These formations came to be called “wormholes”.
They are theorized to have two spheroidal “mouths”, connected by a tunnel.
According to the theory of general relativity, a wormhole’s mouth could be
spotted by the way its gravity affects light passing near it, similarly to a
black hole.
Even if
such a wormhole was discovered, travel through it would be a huge unknown,
since primordially wormholes are theorized to have a size of around 10-33cm,
though it is possible that with the universe constantly expanding they could
increase in time. Second problem with travel comes from the inherent
instability that would characterize such a wormhole. In order to stabilize the
wormhole, an exotic matter would have to be used, and it was only observed in
certain vacuum states as part of quantum field theory.
Source: https://www.space.com/20881-wormholes.html
It would be possible to travel not just through space but through time too, wouldn't it?
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