What is time travel? And what is the science behind it? Is time traveled a proven one If it's done practically, is it a practically proven fact? Yes, apart from proving theoretically, time travel is possible practically too. Have we proven this fact by interacting with time travelers like Noah etc.,
Scientists have proved this using some experiments. They have proved this before 50 years. What are those experiments? If you take "Mahabharata" a Hindu mythological story, A saint-like "Naradha" sets off his travel out to space to see "Lord Brahma", on returning after seeing him, there were several years passed.
Ok, now let's get back to the scientific aspects of time travel. What is time travel according to time travel? For that, we need to know about time dilation. The Speed of light is constant let us think of a thought experiment, A box with 2 mirrors on top & bottom, where light is being traveled inside. The number of times the light traveled inside within 1 second. But in space, the number of times the light traveled in a second differs. On Earth, it travels a shorter distance, but in space, it travels a longer distance. But we can't say light travels fast in space, because it is a constant, as said in experiments like Michelson–Morley. Light doesn't travel faster or slower, it is always constant. So the cause of this could be time. The reason for light traveling faster in space is because, in space, time runs slower., This is time dilation. The faster you travel, the slower you experience the time.
Let me tell you my famous treadmill example, You walk on the treadmill with the number 1,2,3 printed on it. Now after crossing the numbers 1,2,3, you make a jump. But the belt in the treadmill is still running. And when you land back to the belt, it is number 7 and goes like 7,8,9... This is time travel. What happens here is, Earth is rotating at a speed in a particular time, and when you jump after 3 to space, there will be a separate time. In your point of view, time is normal, but when you land back you will continue from 7,8,9., The missed line in between the jump of a treadmill is the time travel. You have time-traveled from 3 to 7 in a forward direction. When you travel in a spaceship, you don't experience any change in time, but time runs faster on Earth. Time dilation affects your body biologically in terms of aging etc.,
You cannot believe what Einstein said theoretically, but it is true and a proven one. It was proven in the 1970s, 50 years back. Hafele–Keating experiment is a famous experiment to prove this time dilation. Cesium atomic clocks are the most accurate clocks in the world. They have synced 3 clocks with two on flights going east & west sides, then another clock is in the lab. All these 3 clocks are perfectly synced. Now after both flights have rotated Earth, all the 3 clocks are checked. There is a time difference among them in microseconds. So from this Einstein's time dilation theory was proven.
The clock that was carried on the flight was also ticketed in the name of Mr. Clock. So time travel is a proven one on a micro-level. Russian Cosmonaut, Sergei Krikalev is the longest time-traveled person, by being in space for 803 days & going forward in the time of 0.02 seconds. There is a concept called the "Twin Paradox". If there are 2 twins, with one traveling to space & the other on Earth, When the space traveled guy comes back to Earth, then the space traveled guy's age would be smaller than his twin brother on Earth. This is a very short duration, but it is a proven truth.
According to the time dilation concept, time is slower in more gravity area & time is faster away from gravity. This was shown fictionally in the movie "Inception". The time of 1 hour on the planet near the black hole is 7 years on Earth. Because of more gravity, time is slower on that planet. Even though it is science fiction, there is truth in it. Likewise, there is a time dilation between people living on Himalayas & sea level, that is the time of top people is 0.003 seconds faster than sea level people The reason for this is those 30 satellites that are revolving around Earth. These satellites maintain time accurately all over the world. These satellites are revolving at a speed of 14000km/hr at above 20000km height. In particle physics, time dilation is proved often. If we take Muon at its particle level, if its normal life is 2.2 microseconds, then when its speed is increased its life is increased to 7 microseconds. The reason for this is its speed, so time is delayed here. So time travel is a proven one, but not as shown in movies on going to the future. We have gone to the future in a time of less than 1 second. Only going to the future is proven, & not going to the past.
Even Stephen Hawkin has conducted one such event. On June 28, 2009, waiting in a secret hall, for the whole day to see if time traveler from a future visit, and it was in the press too. To go to June 28, 2009, to attend the event. None came, so he proved that time travel is impossible in the past. To see the past in life, just look at the sky. The stars you see in the sky are many light years old. The old light of it is only seen to us only now. So from this, we are seeing the past in live mode, this is also a kind of time travel.
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