There are some things that the human being, intrinsically, has longed for since the earliest times: to fly through the skies, win the battle against death or travel through time. All of them, in fact, are somewhat related, and for now we have only put one into practice to a greater or lesser extent . Let’s leave death for other times and focus on what fascinates us excessively; the possibility of going back to the past or moving towards the future.
There are many theories against time travel. Stephen Hawkins said that the absence of tourists from the future in history is an argument against the existence of time travel, although some try to excuse that detail with the theory that if we ever manage to travel to the past we will not be able to do it a time before the creation of a supposed time machine , which has not yet been invented.
Stephen Hawkins said that the absence of tourists from the future in history is an argument against the existence of time travel
The trip to the past, with its paradoxes included and its possible alternative realities, seems very complicated. Future travel, however, is different: all particles travel continuously into the future , since time always flows in the same direction. The passage of time is just the movement into the future according to the theory of relativity. Although it is now beyond our capabilities, the key to being able to do it would be to build a ship that would travel at really considerable speeds, with a ‘but’: the trip would be unidirectional, with no possibility of returning to the past.
Yes? Are we really at the gates of being able to go to the future?
To travel to those ‘considerable measures’ one would have to travel faster than the speed of light. And to travel faster than the speed of light you would have to go a little beyond 300,000 km per second. Needless to say, we haven’t come close to this speed so far: the fastest man-made object, a space probe, traveled at a laughable 150 km per second . But, with the right technological advances, could we really travel faster than the speed of light?
To travel at the speed of light, you would have to go a little over 300,000 km per second. The fastest man-made object, a space probe, traveled at 150 km per second.
Einstein’s theory of relativity determines that time is not universal, it is relative. The Hafele-Keating experiment of 1971 found that a clock flying in a fast-traveling airplane fell behind clocks on the ground. It has also recently been discovered that precise atomic clocks run at different speeds when one moves relative to the other, causing a phenomenon called ‘time dilation’.
As explained in a recent article published in ‘ Science Alert ‘, Dr. Sean Matt, an expert in astronomy and astrophysics at the University of Exeter in the United Kingdom: “If you travel close to the speed of light, time behaves in a different way. different from what we are used to, and in this way, one can move forward in time faster than those who stayed behind. Therefore, it is theoretically possible to travel to the future, but you cannot go back.” This goes in relation to what we said at the beginning of the one-way trips.
Only light can travel at the speed of light, because it has no mass.
Experts generally agree that it is not possible to travel faster than the speed of light, this is also specified in Einstein’s theory. According to astrophysicist Dr Eric Tittley of the University of Edinburgh: “It’s clear that no object or information can travel faster than the speed of light. It’s not about not having enough energy to push fast. From an outside perspective, any additional energy added to a body to reach and exceed the speed of light simply accelerates it asymptotically to the speed of light .”
(Asymptotically means that something gets closer and closer to the speed of light, but never reaches it.) No object can travel faster than the speed of light because as objects travel faster they get heavier. Therefore, only light can travel at the speed of light, because it has no mass. In conclusion, you may be able to travel at high speed thus changing your experience of time , but unfortunately traveling faster than the speed of light (and therefore time travel ) is not possible at the moment.