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Professor Stephen Hawking was a representative of time travel and, before his death this year, he had written his latest book, Brief Answers to Big Questions. In his book, the theoretical physicist wrote: "We can not rule out quick trips in time and in time," but the book was published after his death last March at the age of 76. Cambridge University alumni could not fully explain his theory.
Peter Millington, a researcher in the particle cosmology group at the University of Nottingham's School of Physics and Astronomy, spoke to give an answer.
According to Mr. Millington, a vehicle that can move at the speed of light, 299,792,458 meters per second in the vacuum or nearby, would be able to travel in the future.
Mr. Millington wrote in an article for The Conversation: "Einstein understood that the absolute speed of light meant that space and time themselves could not be.
"And it turns out that moving clocks must be slower than fixed clocks.
"The faster you move, the slower your clock is compared to the one you've passed.
"The word" relative "is the key: time will seem like a normal time for you. For all those who remain motionless, you will be in slow motion.
"If you had to move at the speed of light, you would seem frozen in time – as far as you're concerned, all the others would be fast forward."
But to be able to propel a spacecraft or a machine capable of moving at these incredible speeds, it would take an infinite amount of energy, which would be impossible.
Mr. Millington concludes, "Is time travel really a possibility? Our current understanding can not exclude it, but the answer is probably no. "
However, Professor Hawking said that Einstein's research on gravity, space, and time from 1915 may have solved the problem.
The physicist said that the deformation of space-time, which occurs near massive stars and black holes, could potentially be strong enough for humans to travel in time.
This would happen by deforming the fabric of the universe itself between two points in time and in space – a sort of wormhole traveling in time.
Modern technology may not be able to travel in time, but it is quite possible that future civilizations will exploit this power.
Professor Hawking wrote in his posthumous book: "Einstein has shown that it would take infinite rocket power to accelerate a spacecraft beyond the speed of light.
"So, the only way to go from one side of the galaxy to the other in a reasonable amount of time would seem to be if we could distort the space-time to the point of creating a small tube or a hole of worm.
"It could connect both sides of the galaxy and act as a shortcut to go from one to the other and back while your friend was still alive.
"Such wormholes have been seriously suggested as part of the capabilities of a future civilization.
"But if you can travel from one side of the galaxy to another, you can come back through another wormhole and come back before you leave.
"You could even manage to go back in time with a single wormhole if its two ends were moving relative to each other."
Professor Hawking died at the age of 76 in the early hours of March 14, following a long battle with the motor neuron.
He was suffering from a rare form of slow-progressing, slowly progressive amyotrophic lateral sclerosis (ALS), also known as motor neuron disease or Lou Gehrig's disease.
He was diagnosed with motor neuron disease in 1963 at the age of 21.
The doctors were expecting him to live only two years, but he was suffering from a form of illness that was progressing more slowly than usual.
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