As far as is known, no one in this world can move twice as fast as the speed of light. Moreover, no object of your mass can move faster than the speed of light.
However, it is possible that some strange particles could move twice as fast as the speed of light, sending these particles back into the past.
Universal speed limit
At this time, one of the best theories in physics is the theory of relativity, developed by Albert Einstein. According to this theory, the speed of light is the universal limit of velocity for any object with mass.
In particular, relativity tells us that no object with mass can develop more than the speed of light.
To accelerate an object with mass, we need to add energy to it. The faster we want this object to move, the more energy is needed.
The relativity equation tells us that anything with mass, no matter how much mass it has, needs an infinite amount of energy to accelerate to the speed of light.
However, all the sources of energy known to us are finite: they are somewhat limited.
Indeed, perhaps the universe contains only a finite amount of energy. This should mean that there is not enough energy in the universe to accelerate any object of mass to the speed of light.
Since you and I have mass, we really should not expect to be able to move twice as fast as the speed of light in the near future.
This universal limit of velocity applies to everything we might call “ordinary mass.”
However, there are hypothetical particles, called tachyons, with a special kind of mass called the “imaginary mass.”
There is no evidence of the existence of tachyons. However, in terms of relativity, their possible existence cannot be ruled out.
If they still exist, tachyons should always move faster than light. Just as anything of ordinary mass can not exceed the speed of light, tachyons should not be able to move slowly at the speed of light.
Some physicists believe that if tachyons exist, they must constantly travel back in time to the past. This is why tachyons are associated with time travel in many science fiction books and movies.
There is an opinion that one day, we can get tacos and build a time machine. But for the time being it remains a distant dream and we do not have the ability to fix potential tachyons.
The shortest way?
It is unfortunate that we can not travel fast at the speed of light. Our Sun’s nearest neighbor star is 4.35 light-years away. Consequently, at the speed of light, it would take us more than four years to get there.
The most distant star ever discovered is about 28 billion light-years away. Consequently, drawing a diagram of the whole universe is an almost incredible thing.
Relativity gives e. წ. Allows for the presence of wormholes.
The wormhole is the shortest path (shortcut) in space between two points. Although under normal conditions a star can be 4.5 light-years away from us, a wormhole can be just a few hours away from it.
If real wormholes really existed, they would allow us to travel long distances in very short periods of time – we would reach the farthest reaches of the universe in a lifetime.
Unfortunately, like tachyons, wormholes are completely hypothetical.
While we can not really travel faster than light, we can still imagine that we can.
This kind of thinking is called “counter-factual thinking”. This time we discuss what things should be like or what they would be like if the reality were so different.
We can consider many different possibilities, each with different principles of physics.
So we can not say for sure what would happen if we could travel faster than light. At best, we can imagine what could have happened. Could we travel to the past? As some scientists think tachyons can.