Into The Universe With Stephen Hawking: Time Travel Documentation

The promise of time travel has long been one of the world’s favorite scientific “what-ifs?” Hawking explores all the possibilities, warping the very fabric of time and space as he goes. From killing your grandfather to riding a black hole, we learn the pitfalls and the prospects for a technology that could quite literally, change everything.

Copyright © Discovery Communications

Official Source: http://www.youtube.com/watch?v=Yn4WHIxTa50