Dr Cox, who is best known to the public for being his work with the BBC, is a professor of particle physics at the University of Manchester.
However, the 51-year-old also once sat on a panel for ABC’s “QA” programme, which puts experts together to discuss hot topics.
Asked in 2014 if it was possible to travel back in time, he said: “In Einstein’s theory, where you have a four-dimensional space, then you are prevented from travelling back in time.
“You can imagine wormholes and this idea that you can tunnel through and take shortcuts, but it would be like going from London to Australia through the Earth.