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| Professor Brian Cox |
Speaking at the British Science Festival, Cox said, "Can you build a time machine? The answer is yes."
However, the theory only works when travelling to the future and Cox explained that once in the future it's not possible to come back.
Prof. Cox is set to give a scientific talk on the theory of time travel to mark the 50th anniversary of Doctor Who in London next week.
The presentation will form part of a set of anniversary shows that will be shown before BBC's Day of Doctor episode on Nov. 23.
During his speech at the Birmingham-based science festival, Cox said time travel has already been done, on a very small scale.
He added that if the technology was developed to accelerate larger objects, it could be possible for humans to travel to the future, similar to Doctor Who's Tardis in the TV show.
Yet this technology doesn't exist yet, and will never be able to take people back to the past.
"You can go into the future; you've got almost total freedom of movement in the future," said Cox.
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