Impossible Journey ![Impossible Journey (Hong Kong) - 8 Interesting Theories About Time Travel [Plethrons.Com]](http://plethrons.com/wp-content/uploads/2013/09/Impossible-Journey-Hong-Kong-8-Interesting-Theories-About-Time-Travel-Plethrons.Com_.jpg)
Hong Kong physicists claim that time travel is impossible. By failing to get a single photon to travel faster than light they argue Einstein’s limits must be followed.
Quantum Barriers ![Quantum Barriers - 8 Interesting Theories About Time Travel [Plethrons.Com]](http://plethrons.com/wp-content/uploads/2013/09/Quantum-Barriers-8-Interesting-Theories-About-Time-Travel-Plethrons.Com_.jpg)
Some believe that quantum mechanics prevents changes in the timeline. This means if you went back in time you wouldn’t be able to change anything that would affect the future.
Source: Discovery, Space.Com, BBC, The Telegraph.
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