Is Time Travel Actually Possible?

Have you ever wanted to go back in time? Time travel is a staple of science fiction, with novels and films exploring the advantages and disadvantages of such a capability. I'm sure we've all had the desire to go into the past to see how things were or perhaps alter something, but would you rather go into the future to see how things end out? But to comprehend how we may travel through time, we must first determine if time travel is indeed conceivable and, if so, what is required to achieve it.

We must first determine the time. The concept of time was viewed in classical physics as something that existed for everyone everywhere in the universe, was independent of anyone who perceived it, and advanced at the same rate for everyone. This meant that a cause always came before an effect, never the other way around, which is something that the structure of the universe depends on. The problem with this understanding of time is that it does not hold in all circumstances, which is why Einstein's theory of relativity is so important. According to the theory of relativity, time is a component of four-dimensional space-time that is subject to external influences. On a human level, this means that an astronaut orbiting the Earth will age slower than those of us who remain on the planet. For example, objects moving at high speed experience hunching slower than those moving with less velocity, and there's a similar effect for objects held within gravitational fields.

Black holes, for instance, have the strongest gravitational poles of any object in the universe; they are so powerful that light itself cannot escape from them, and they also cause time to slow down to an extreme degree. If you were to fall into a black hole like poor Matthew McConaughey did and look out into the rest of the universe, you would theoretically witness hundreds of millions of years' worth of events before your ultimate demise. When traveling faster and faster, time slows down for you, and this cycle continues until you reach the theoretical speed at which nothing can travel. At this speed, time has slowed so much that events appear to occur instantly. For instance, consider a photon of light that is emitted by a star on the other side of the universe; even at its incredible speed, it will take many millions of years to reach you.

The challenging part of the course is going backward in time. If at the speed of light time is stagnant, does that mean if you were to travel faster than the speed of light, then does that mean if I were to work in reverse? Many researchers think so.

One theory is that of wormholes, which act as tunnels through the fabric of space-time and could create a path between any two places at any given time. The theory of relativity allows for wormholes to exist, but the energy levels required to create one would be astronomical. Tachyons would work in reverse for cause and effect, but some people believe that harnessing them could be the best route to learning how to travel through time.

Stephen Hawking thought that wormholes would be inherently unstable and unable to function as time machines for very long because of radiation feedback, which functions similarly to the feedback of sound. However, other researchers have proposed several ways that space-time could be used to enable time travel. The formation of a so-called quantum tunnel between universes may be made possible by the use of lasers, quantum physics, or string theory, and it may also be possible to travel back in time by using cosmic strings and black holes, according to some theories.

In conclusion, the idea of time travel has long been intriguing to researchers, and for a long time, it was believed to be completely impossible. However, with advances in our knowledge of the universe over the past century, it is no longer considered to be completely impossible, but it is still an ability that lies well beyond our current capabilities and the law of physics to allow for it to happen, and it may very well be something that happens in the future.