Time Travel has always been an open discussion of whether it is possible or not. In the video below Professor Brian Cox – who is a confirmed Doctor Who fan – undertakes an experiment with a light that shows time moves faster for a stationary clock than a moving clock, which appears to move more slowly over the length of time.
The theory is based on Einstein’s Theory of Special Relatively that states to travel forward in time, an object would need to reach speeds close to the speed of light. As an object approach these speeds, time slows down but only for that specific object travelling.
The laws of time travel in Doctor Who are pretty fluid, with either the Doctor being able to change events in time or finding that they’re predetermined. His conclusion is that time travel is possible, but only into the future!