The possibility of time travel has excited the human race for hundreds of years, inspiring countless books, and more recently, movies. The ability to move not only through space but into the past or future would open up countless possibilities for humanity. Supposedly, if we were moving at the speed of light, we could travel through time.
In one of the films about Superman from 1978, the superhero returns to the past by flying around the Earth in the opposite direction of its rotation faster than the speed of light.
This is incredibly fast, because the light moves just under 300,000 kilometers per second. So far, people have not even come close to this speed. The fastest man-made object, a space probe, traveled only 150 kilometers per second.
However, if you travel at approximately the speed of light, time no longer behaves as we are used to, so you can progress in time faster than those who move more slowly. So, theoretically, it is possible to travel to the future, but it is not possible to return to the past “, notes astrophysicist Dr. Sean Matt from the University of Exeter.
Also, we must keep in mind, as Professor Eric Titley, an astronomer from the University of Edinburgh, states, when we say the speed of light, it refers to the speed of light in a vacuum. Light is slower when moving through water or air.
Do we experience time differently when traveling at high speed?
Namely, Hafele and Keating flew around the world twice, first to the east, then to the west, with four sets of atomic clocks with cesium, after which they compared the “traveling” clocks with those that remained in the United States Naval Observatory.
The flights were performed on conventional aircraft on scheduled commercial flights. It turned out that the clock in the plane moving east, in the direction of the Earth’s rotation, worked faster (resulting in a relative loss of time).
Is it possible to travel faster than the speed of light?
All experts agree that it is not possible to travel faster than the speed of light, which is also specified in Einstein’s theory.
It’s not about whether we have enough energy to run it. From the outside, any energy added to the body to reach and exceed the speed of light only accelerates asymptotically to the speed of light.
“Asymptotic” means that something closer to the speed of light is never reached.
No object can travel faster than the speed of light, because the faster objects travel, the heavier they become. Therefore, only light can travel at the speed of light – because it has no mass.
Traveling at high speed will only change our experience of time, but traveling through time traveling faster than the speed of light is unfortunately not possible.