The concept of time travel is always around in movies, sci-fi novels and discussions. For centuries, scientists, philosophers and the public have been exploring the possibility of time travel. By the combination of laws of physics and laws of Universe and results in that, time travel backwards is not realistic but travelling forward is possible.
Albert Einstein first proposed that if you travel with the speed of light away from Earth time would slow down for you, while those back on Earth would experience time at the normal rate.
Theoretical physicist and string theorist Brian Greene, of Columbia University, said: “You can build a spaceship, go out into space [and travel] near the speed of light, turn around and come back. Imagine you go out for six months and you turn around and you come back for six months.”
Time stays slow relative to the people who are standing still back on Earth when you are travelling at the speed of light.
Prof Brian Greene says: “When you step out of your ship, you’re one year older but Earth has gone through many, many years. It can have gone through 10,000, 100,000 or a million years depending on how close to the speed of light you traveled.”
As a result, you would be going fast while your clock would still be going slow.
Stephen Hawking has some of his contributions in this regard.
In the past, he said: “It would take six years at full power just to reach these speeds. After the first two years, it would reach half-light speed and be far outside the solar system. After another two years, it would be traveling at 90 per cent of the speed of light. After another two years of full thrust, the ship would reach full speed, 98 per cent of the speed of light, and each day on the ship would be a year on Earth. At such speeds, a trip to the edge of the galaxy would take just 80 years for those on board.”
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