S4 · E9Apr 27, 2012 · 44 min
S4 · E9Apr 27, 2012 · 44 min
Is it possible that sightings of alien beings or UFOs may actually be evidence of time travelers from the future? And might ancient astronauts actually be time travelers from our future? Scientists explore the theoretical possibility of time travel. How can it be achieved? And what might people from 10,000 years in the future look like?
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