The good news? Science says we can go back to the past. The bad news? We probably won't ever get there. Here's why.
Sure, TARDIS may be the name of the time machine in Doctor Who, but it's also the name of the hypothetical device that physicists posit could make time travel possible.
Researchers Ben Tippet and David Tsang developed a mathematical formula to describe how TARDIS would work a formula that they say proves time travel is theoretically possible, Their paper is published in the journal Classical and Quantum Gravity.
"People think of time travel as something fictional," Tippett said in a news release. "And we tend to think it's not possible because we don't actually do it. But, mathematically, it is possible."
Essentially, the theory has to do with the curvature of spacetime: Tippett says that the four dimensions (the three space dimensions, plus time) should be imagined to be connected, so that time could (theoretically) be bent into a circle for passengers