Time Travel

November 23, 2013 marked the 50th anniversary episode of the popular British sci-fi show Doctor Who. The Doctor is a time-traveling alien from the planet Gallifrey who moves through time and space to save the universe from evil. He takes along with him a human companion, and together they travel in the TARDIS (Time and Relative Dimension in Space). But what is the science behind the TARDIS and time travel?

timetravelScientists believe that time travel is theoretically possible. One potential way would be to move faster than the speed of light. However, this would require the object to have both infinite mass and zero length. Another possibility would be to use wormholes as a shortcut through space. The problem with this theory is that the existence of wormholes has not yet been proven, and creating a stable wormhole is beyond the technology that we have. Dozens of other ideas on how to time travel have been thrown around, including using black holes, cosmic strings, and infinite cylinders. Scientists have not yet been able to find a way to manipulate these things in order to time travel.

If time travel were to exist, we must then ask ourselves how time and space would overcome paradoxes. For example, in the grandfather paradox, if a time traveler were to go back in time and kill his or her parent or grandparent, would the time traveler be able to exist? Though in theory, time travel may be possible, many scientists are doubtful that humans would be able to move in time. But as our knowledge of space and time progresses, who knows what we might discover?

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-Luyan Lin

Source: http://www.space.com/21675-time-travel.html


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