Professor Stephen Hawking, who died in March this year at the age of 76, shed light onto the science of time travel in his last published book Brief Answers to the Big Questions.
The world-renowned physicist found the idea of time travel a tantalising one and the topic often appeared in his work.
In his final book, published seven months after his death, Professor Hawking dropped major time travel revelations that could shake modern physics to its core.
Professor Hawking wrote: “Rapid space travel and travel back in time can’t be ruled out according to our present understanding."
He studied the possibility of time travel within the confines of euclidian geometry, general relativity and the laws of physics.
According to Albert Einstein’s law of general relativity, moving faster than the speed of light is key to travelling in time.
But in order to power a spacecraft or machine capable of travelling at these immense speeds would require infinite amounts energy.
Einstein already knew in 1905 this conundrum meant travelling backwards in time was not possible.
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