UFO Secret - Contacts with Time Travelers

http://youtu.be/_wfcULstc5c

NOVA examines the feasibility of time travel.

• challenges early theories that time travel might be possible using a black hole.
• describes how wormholes, predicted by Einstein's theories, might provide a shortcut through time and space.
• shows how modern jet travel and atomic clocks have been used to prove Einstein's theory of special relativity.
• presents the views of such scientists as Carl Sagan, Stephen Hawking, and Kip Thorne.
• examines the consequences of the grandfather paradox and shows how laws of physics might prevent time travelers from changing the past, thereby affecting the future.
• presents a controversial experiment that claims to have sent a signal faster than the speed of light.
• introduces reasoning that the laws of relativity prevent a time traveler using a wormhole time machine from going back to a time before the machine was built.
•