Segments in this Video

Time Travel Paradoxes (09:28)


The arrow of time is a one way street of irreversible events because everything in the universe moves from an orderly to a disorderly state; according to the theory of relativity, space and time are linked in spacetime. Physicists believe nature might act in one of three ways to prevent time travel paradoxes: first, by making time travel into the past impossible, there are multiple universes, or if time travel is possible then it would be impossible to change the past.

Theoretical Time Travel (04:10)

Scientists have placed atomic clocks on rapidly moving rockets and airplanes and have discovered that they underwent time dilation; a Russian cosmonaut, Sergei Krikalev, holds the record to the most time traveled. Einstein's Theory of Relativity states high gravity, such as the type found around a Black Hole, can also slow clocks; wormholes are theoretical shortcuts through time and space.

Time Machines (07:48)

Starships are the best bet that scientists have when theorizing the possibility of time and lengthy space travel; the closest star to the Earth is twenty-five trillion miles away. Physicists did significant research on instantaneous time travel when helping Carl Sagan with information for his novel "Contact" in which he introduced the idea of natural wormholes to the public; theoretically, time travelers could enter wormholes in reverse to return to the past.

Studying Particle Physics (07:04)

The Large Hadron Collider is at the frontier of the newest developments in the world of physics; this machine accelerates protons to the speed of light and then collides them. Many physicists believe time traveling methods will be discovered in a few years, but others think humans will not exist long enough to discover how to do it.

Harnessing Dark Energy (07:58)

Sending objects or individuals into warp drive is problematic for some physicists because they believe once they enter the bubble, they would be unable to exit; to combat this, some scientists think they could create warp-drive escalator corridors which would function like bullet trains. The Alpha Centauri System is our sun's closest neighbor, and main contain an Earth-sized planet that is on the verge of discovery; this binary system might be home to two terrestrial-sized planets according to advanced computer simulations.

Discovering New Planets (05:59)

The starship needed to travel to the Alpha Centauri System would also need to be a time machine that would arrive in the binary system in just under two months; scientists discuss the different ways they can detect newly discovered planets, one of which being the "wobble method." Theoretical spacecraft would have high-speed capabilities which would propel them into time machine mode making it able to reach distant planetary systems.

Credits: Time Travel (00:24)

Credits: Time Travel

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Time Travel

Part of the Series : The Universe
DVD (Chaptered) Price: $169.95
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One of the Universe's most enduring mysteries is time travel. In this episode, we explore the possibilities. Discover why time travel into the future is unavoidable in the Einsteinian world of Relativity.

Length: 45 minutes

Item#: BVL160958

Copyright date: ©2010

Closed Captioned

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Only available in USA and Canada.