The theory of special relativity proposed by physicist Albert Einstein holds that time is an illusion that moves relative to an observer. An observer traveling near the speed of light will experience time and all its consequences (boring, aging, etc) much more slowly than a resting observer. This is why, after a year in space, astronaut Scott Kelly has aged a little more than his twin brother who remained on Earth.
Other scientific theories about time travel exist, including exotic physics based on wormholes, black holes, and string theory. Time travel, for the most part, remains the domain of an ever-expanding array of science fiction books, movies, TV shows, comic books, video games, and other media.
In 1905, Einstein proposed his theory of special relativity. It has become one of the fundamental tenets of contemporary physics, along with its later extension, the theory of general relativity. Special relativity deals with the interplay between space and time for bodies moving in a straight line at a constant speed.
The short version of the theory is supposed to be simple. First of all, everything is measured in relation to something else, that is, there is no “absolute” frame of reference. The second one is the speed of light has a fixed value i.e 3 Lakh km/sec. It remains the same no matter what is measured or where it is measured from. Finally, nothing can travel faster than the speed of light.
Real-time and real-time travel emerge from these fundamentals. An observer traveling at high speed will travel through time at a slower rate than an observer not moving through space at high speed.
Time travel has long played an important role in fiction. Humans have been dreaming of warped time since the "Mahabharata", an ancient Sanskrit epic compiled around 400 BC.
In "Mahabharata", which is an ancient Indian mythological book, there is mention of the time travel of Lord Krishna in "Mahabharta". According to Indian mythology books, KaliYuga existed for 432,000 human years. A Maha Yuga is a cycle of four Yuga. One year and one day in the life of Lord Brahama: Every year Brahma has 360 days, and we are now in the 51st year of our present Brahma period.
Every work of time-travel fiction builds its own version of spacetime, ignoring one or more scientific obstacles and paradoxes in order to meet the plot's requirements.
Some films, such as Christopher Nolan's 2014 blockbuster "Interstellar," make a reference to science and physics. In the film, a guy played by Matthew McConaughey spends a few hours on a planet orbiting a supermassive black hole, but due to time dilation, watchers on Earth see those hours as a matter of decades.
We only can go backward in time by traveling 99.99% speed of light and see what is happening back in time.it doesn't mean that we cannot go in the future, there is the possibility of traveling to the future.
Now with evolving technology, we are almost trying to travel 99.99% of the speed of light to travel in the past. There are still different possibilities about time travel other than Einstine's concept which may become in front of us in upcoming years.
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