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Is time travel possible?

We all travel through time. In the last hour, I traveled through 1 hour. So did we all. However, going faster than time, either into the future or into the past is not yet possible. Time travel, as is often shown in fiction stories and movies, involves someone traveling into the future or into the past. The reality is different.


According to physics, it is possible to travel faster than time, which means one can actually go into the future. To achieve this, one must travel at speeds very close to that of light. It would require extraordinary amounts of energy to achieve that, not to mention other challenges (such as space craft design, life support, coming back, etc.). The concept of the "twin paradox" is often used to illustrate this, where one twin travels at almost the speed of light and comes back a few years later, only to find his twin is very old. 


Going back into time is even more challenging. Theoretically, one can travel through worm holes (which are distortions in the space-time fabric) and reach a past time. However, this is a theoretical concept and we are yet to find a stable enough wormhole (or even an unstable wormhole). Another way would be to travel faster than light, something which is not possible according to our current understanding of science.


Thus, time travel is not yet possible.


Hope this helps. 

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