The simplest answer is that time travel cannot be possible because if it was, we would already be doing it. One can argue that it is forbidden by the laws of physics, like the second law of thermodynamics or relativity. There are also technical challenges: it might be possible but would involve vast amounts of energy.
The Short Answer:
Although humans can't hop into a time machine and go back in time, we do know that clocks on airplanes and satellites travel at a different speed than those on Earth. We all travel in time!
Time travel is still impossible because all these theories can't be tested practically. Scientists are trying to make a time machine, but it all seems possible in science-fictional movies. You will find several people claiming to time travel, like Alexander Smith. But no one has concrete proof to support their claim.
What did Albert Einstein say about time travel? Einstein stated that it is possible for one to travel into the future if one travels at the speed of light. If this were to occur, the individual would age slower than those on Earth, traveling at its speed.
According to Stephen Hawking, time travel is possible, and not just in the way we might think. Backward time travel is not supported by Hawking's theories, because new matter (a new you) would need to be created – one existing in the past and one in the present, traveling back in time.
Surprisingly, yes. At the level of quantum particles (we are talking individual photons, elementary particles or individual atoms), there is something called Wheeler's delayed-choice experiments that show that actions in the present can influence the past.
The idea is that backwards time travel is impossible because if it occurred, time travellers would attempt to do things such as kill their younger selves (or their grandfathers etc.). We know that doing these things—indeed, changing the past in any way—is impossible.
NASA's James Webb Space Telescope is often called a “time machine.”
One of the most effective ways to let go of the past is to embrace the present. Instead of reliving the past and getting consumed with negativity, keep yourself active and enjoy the current moment. Learn a new skill. Meditate.
In order for you to stop time, you would have to be traveling infinitely fast. Nothing can travel faster than light (let alone infinitely fast) without gaining infinite mass and energy, according to Einstein's theory of relativity.
Intergalactic distances are roughly a hundred-thousandfold (five orders of magnitude) greater than their interstellar counterparts. The technology required to travel between galaxies is far beyond humanity's present capabilities, and currently only the subject of speculation, hypothesis, and science fiction.
In fact, according to Albert Einstein's famous equation, E = mc² , time travel is possible, at least in one direction.
Most physicists agree that you cannot change the present by going back to the past. The Novikov self-consistency principle is a formal statement of this assertion. If we are able to go back to the past, and make changes, the universe will simply rearrange events so that the present stays the same.
One idea from the 'multiverse' hypothosis is that if you did go back in time & met yourself, time (& hence reality) would 'branch off' and develop in a way that is different from the way it developed in your memories.
Our past experiences can affect our current mindset and our choices in how we interpret our lives. If pain or trauma has been experienced in our past, it can impact how we view our current circumstances or even prevent us from living in the present.
In verse 12, God says, "For I will forgive their wickedness and remember their sins no more." This is where God changes the past of all who commit their lives to Him. He forgives our sins and forgets them!
I wouldn't go back in time to change things because I would never have realized that I needed to stop blaming everyone and everything else for my problems. I would never have discovered that my failures and mistakes were a product of my own doing. I created the problems. I helped to fester them in my own mind.
Traveling into the Future
While it's not possible (yet) to travel to the future fast than the rate at which we're doing it now, it is possible to speed up the passage of time. But, it only happens in small increments of time.
As you might expect, the possibility of time travel involves those most extreme objects, black holes. And since Einstein's theory is a theory of space and time, it should be no surprise that black holes offer, in principle, a way to travel through space, as well as through time. A simple black hole won't do, though.
In the Back to the Future franchise, the DeLorean time machine is a time travel device made by retrofitting a DMC DeLorean vehicle with a flux capacitor, which allows for time travel when it hits 88 miles per hour.