Could time travel be possible? Scientists say it’s ‘theoretically feasible’

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In Einstein’s theory of special relativity, time travel is theoretically possible but physically impractical. In special relativity, a moving object appears to experience time at a slower rate than a stationary object. This effect has been confirmed by experiments. If one could move at a speed approaching the speed of light, then the difference in the apparent passage of time could be significant. However, this would require an enormous amount of energy, making it impractical.

Einstein’s theory of general relativity also allows for the possibility of time travel. In general relativity, time is a fourth dimension. Space and time are interwoven in a four-dimensional fabric called spacetime. Objects in spacetime can move freely in any direction, including forwards and backwards in time.

However, general relativity also says that it is impossible to travel faster than the speed of light. So even though time travel is allowed by the theory, it is still physically impossible.

There are also certain solutions to Einstein’s equations that describe the spacetime around rotating black holes. In these solutions, time travel is possible in principle but again it is impractical. These solutions contain what are called closed timelike curves (CTCs). A CTC is a loop in spacetime that allows an object to return to its own past.

So far, there is no experimental evidence that time travel is possible. And it is not clear if it will ever be possible. But it is an interesting idea that scientists are still exploring.

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