Time travel is long in sci-fi movies, everyone has heard of
time travel at a point of their lives. My physicists believe backwards time
travel is not possible.
How does time travel actually works;
It turns out that objects traveling faster than the speed
of light could go back in time……but in the process, a pair of phantom doubles
of the speedy object would pop out of the thin air, and one will go backwards and
be annihilated with another, according to one hypothesis.
Can something really travel faster than the speed of light?
Maybe if we go to hyperspace where the rules of nature don’t
apply, that one is in star wars, where they travel in the speed of light using
hyperdrive. Wait, we are in real world here, according to Special Relativity,
nothing can travel faster than light in a vacuum. Such speeds are technically
possible, but relativity dictates that anything with mass becomes heavier as it
zips faster and faster, so reaching and surpassing the speed of light would
take infinite energy.
It is generally believed in physics that nothing can travel
in the speed of light. And while physicists can send subatomic particles called
muons forward through time, the issue with backwards time travel is causality.
Time has an arrow that points forward. Without this
safeguard, all sought of absurd situations can occur, such as the grandfather
paradox and other several sci-fi movies. If you go back in time to kill your
grandfather, your dad won’t exists and you won’t go back to kill your
grandfather the first place?
To understand the implications of relavistic backwards time.
A space ship would start on a launching pad on earth, travel at five times the
speed of light to a planet about 10-light years away, then turn around to home
to a landing pad not far from the lift point.
It turned out that the pair of ghost-ships, one with
negative mass and the other with positive mass, must appear out of thin air.
Five years after embarking, Earthlings would see a very
strange apparition. Because light from the spaceship travels slower than the
spaceship itself, after the vessel returned and sat on the launching pad,
earthlings would see images of the spaceship on its way out and another
doppelganger spaceship on its way back.
Eight years later, things would be even odder: an image of the
spaceship sitting on the landing pad would be visible, as would two images,
like a hologram.
Finally, after a bit more than 10 years, the phantom
spaceship pairs would annihilate each other and you’d be left with the ship
sitting on the landing pad.
The thought of this experiment prompts a lot of questions.
How would it work? What would be the two space ships made of? Which spaceship
would be the real one? And what would the people in the space ship be doing?
With all that…….. what if traveling faster than light is
not information?
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