The question of whether time is reversible remains one of the greatest unsolved questions in science. If the universe obeyed the laws of thermodynamics, time travel would not be possible. According to the second law of thermodynamics, our world can never return to its previous state. So time can only go forward.
But there is also physicist Albert Einstein’s theory of special relativity. He suggests that time flows at different speeds for different people. Moreover, someone flying through space at close to the speed of light will experience time slower than a person on Earth.
Scientists found that astronaut Scott Kelly, who spent 520 days on the International Space Station, aged slightly slower than his twin brother and fellow astronaut Mark Kelly. This is because it moves much faster in space.
There are also paradoxes regarding time travel. For example, the “grandfather paradox,” the possibility of accidentally preventing your grandparents from meeting by going back in time. This would lead to a paradox in which man should not exist at all.
Source: Ferra
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