Time travel:Possible or not?

Have you ever had a desire to go back in time? We all have, I’m positive. Perhaps you want to look at what happened in the past.

Would you rather return to the past to see how things were, alter something, or travel into the future to see how things pan out?

Science fiction frequently features time travel, with books and movies depicting the advantages and dangers of such a power. But is time travel actually conceivable, and if so, what would we need to be able to achieve it?

We need to first understand what time is in order to comprehend how we might go about going across time.

According to classical physics, time is a universal concept that applies to everyone and everything in the cosmos.

It moves forward at the same speed for everyone regardless of who perceives it.

This implies that a cause always precedes an effect and never the other way around.

The issue with this concept of time is that it is not universally applicable, which is something that the universe’s structure depends on.

Because it describes how time changes, Einstein’s theory of relativity is regarded as one of the most significant scientific discoveries ever. According to the theory of relativity, time is one of four-dimensional space-time and can be affected by a variety of variables, including fast-moving objects.

For instance, people with more experience hunch slower than people traveling more slowly, and on a human level, things held within gravitational fields have a comparable effect.

An astronaut in orbit around the Earth will age more slowly than those of us who are still on the planet, but this has a lot more unintended repercussions. Take black holes as an example. They claim that their item has the strongest gravitational poles of any object in the cosmos. They are so powerful that they prevent light from escaping and significantly slow down time. According to theory, if you were to experience what poor Matthew McConaughey did and fall into a black hole while gazing out at the rest of the universe, you would theoretically see events that would span hundreds of millions of years before you either met your inevitable end or ended up stranded behind some bookcases.

Even if it were possible to escape, so much time would have passed on the outside that it would be impossible to recognize life as we know it. As you accelerate toward the speed of light, time begins to slow down again for you. This process continues until you reach the theoretical top speed that anything can achieve — the speed of light.

At this pace, time has slowed to the point where events appear to occur instantly.

Consider a photon of light coming from, say, a star on the opposite side of the universe.

Even at its amazing speed, it will take many millions of years for it to arrive on Earth and be visible to our eyes as a twinkling in the sky.

Even so, the photon’s journey is instantaneous — it originates, travels at the speed of light, and then arrives at us in the same instant. Time moves neither forward nor backward; it is neutral. Therefore, if moving quicker makes time seem slower for you than it does for everyone else, this could be a means of moving through time.

Even if you leave Earth quickly and come back, many years would pass without you aging noticeably.

Going back in time is obviously very challenging if time is moving at the speed of light.

Does that imply that it would operate in reverse if you were to go more quickly than the speed of light? Many scientists believe this to be the case, and there is a theory that the tachyon, a subatomic particle, truly does this.

These particles are hypothetical and have never been detected in reality, in part because if the theory were accurate, you would never be able to witness them approaching as this event would be taking place in the future.

Tachyons would operate in reverse according to the laws of cause and effect, yet some people think that utilizing them could be the key to discovering how to travel through time.

Wormhole idea is an additional hypothesis. They serve as passageways between space-time and can at any time open a route between any two locations. Although wormholes are theoretically possible, the amount of energy needed to generate one would be enormous and might even result in the creation of a black hole.

Stephen Hawking thought that wormholes would be intrinsically unstable and unable to endure for a long period to be employed as a time machine due to the radiation feedback, which functions similarly to the feedback of sound.

Other scientists have proposed various methods for using space-time to enable time travel. It’s possible to manufacture gravity at extremely high levels using lasers.

String theory may reveal how cosmic strings and black holes could enter wine to bend space-time sufficiently for time travel. Quantum physics may allow the development of a so-called quantum tunnel between universes.

In conclusion, the idea of time travel has long piqued the interest of scientists and all of us at some point. It’s no longer considered to be entirely impossible because to developments in our understanding of the world over the past century, but it still sits well beyond of our current capacity. At the very least, we hope it does become something that is more fact than fantasy in the future.