We all occasionally have nightmares of going back in time.
Wouldn’t it be amazing to travel back in time to alter a terrible choice or relive an event—those carefree childhood years, the night you won an Oscar, or to speed forward to see how things pan out in the distant future?
The enigma of time travel is fascinating and exciting.
Is time travel a possibility?
Can we locate a shortcut to the future or a doorway to the past?
Can we eventually control time itself using the principles of nature? It used to be thought that time travel was unscientific.
I used to shy away from discussing it for fear of coming across as a lunatic.
But I’m not as careful these days. Actually, I resemble Stonehenge’s builders more.
My obsession with time.
Marilyn Monroe, in her prime, or Galileo, pointing his telescope to the stars, would be my first stop if I had access to a time machine.
I might even travel to discover how our entire cosmic narrative concludes at the end of the cosmos.
To comprehend how this can be conceivable, we need to look at a time as physicists do — at the fourth dimension.
It’s not as difficult as it seems. Every attentive student is aware that everything in the physical world has three dimensions, including me sitting in my chair.
Everything has three dimensions: width, height, and length.
However, there is another type of length—a length in time.
A human may live for 80 years, but the solar system will continue for billions of years, and Stonehenge’s stones have been there for thousands of years.
Each and every object has a length, both in time and in space. Traveling via this fourth dimension entails traveling across time.
Let’s go a little bit closer to a theory of everything now.
Theory of Everything
Since the time of Isaac Newton, we have understood that mass and gravity are intricately related.
His alleged unification moment was originally theorized when, out of the blue, an apple dropped on his head while he was enjoying afternoon tea under an apple tree in Woolsthorpe.
This occurrence led Newton to hypothesize that the moon’s orbital motion and the apple’s fall to the earth could be caused by the same force.
He continued by demonstrating that it held true for all masses and that gravity acts to draw all bodies together.
It was said in the tabloid newspapers of the period that “Love is a gravitational law” and that “We are merely bodies-driven to be drawn to one other by Newton’s gravitational interactions.”
Einstein joins the scene.
With his general theory of relativity, Einstein advanced the field in the early 20th century and provided yet another unifying insight by demonstrating how mass and gravity are related to time.
The way we view light is fundamentally altered by this work. Nobody had given the speed of light any attention up to that point; it was just another universal constant that experimental physicists were working to quantify with ever-increasing precision. There was little understanding of light waves’ drastically different sounds and water waves.
But you can demonstrate that time slows down for someone who is traveling by utilizing the arithmetic you learned in school, known as Pythagoras’ theorem, and with a little assistance from Einstein’s time dilation formula.
According to Einstein’s theory, you have to move very, very quickly if you want to slow down time—basically, if you want to time travel!
Consider embarking on a voyage from Earth in the year 2000, for instance.
When you leave now until the year 2032, you’ll be moving at a pace of around 95% the speed of light (around 285,000 km a second).
The remarkable thing is that you would be 22 years younger than anyone you left behind, and your watch would still say it is 2010 when it is actually 2032 on Earth.
That is time dilation, and it does operate at slower speeds as well, but to a much lesser extent.
Now, building the time machine.
However, there is a catch: 285,000 kilometers per second are really fast.
Even the fastest spacecraft can only escape Earth’s atmosphere at a dismal 10 km/s, while the fastest land vehicle couldn’t even reach 1 km/s.
Even if humans could travel at these speeds, it’s doubtful if our bodies could handle the strain. Time travel into the future is thus conceivable but currently too challenging. What about, though, the past?
I don’t know about you, but whenever I read anything on time travel, I always feel a little bit duped.
All this information is given to me, but no one ever explains how to construct a time machine.
With sincere gratitude to Professor Frank Tipler, the design for such a thing is provided below so as not to deceive you.
In 1974, Tipler wrote a paper describing how to construct a time machine called a Tipler Cylinder. You may go back in time with the help of this machine.
To start, you’ll need a lot of cash to purchase a big cylinder. I really do mean large—perhaps a hundred kilometers long.
The cylinder must be extremely tightly packed together and have a mass that is at least equal to that of the sun.
To detect a wash of gravity waves emanating from this structure, you would need to start it revolving faster until it rotates so quickly that it begins to damage the fabric of both space and time.
A health warning is also necessary since being too near to such a thick structure might be problematic.
We are drawn to the surface of the Earth by its mass, but coming too near to anything this large would be extremely dangerous since it would pull you in its direction and crush you.
However, if you can get beyond this squashing issue, move closer to the revolving cylinder and begin to track its spin.
As you do so, odd things will start to occur. Because traveling around the cylinder in the opposite direction of rotation will cause you to travel backward in time, your route, which ordinarily inextricably advances you through time, alters.
The machine causes time to go backward; as a result, the further back in time you travel, the longer you follow the machine’s spin.
Simply walk away from the cylinder and return to Earth to restore normal movement, and you will find yourself back in the present, though somewhat that is in the past.
Time travel is a genuine phenomenon, yes.
But it differs slightly from what you’ve undoubtedly seen in movies. It is possible to feel time passing at a rate other than one second per second under specific circumstances.
We must comprehend this type of time travel that occurs in the actual world because of several crucial factors.