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  2. Time travel - Wikipedia

    en.wikipedia.org/wiki/Time_travel

    It is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality. Forward time travel, outside the usual sense of the perception of time, is an extensively observed phenomenon and is well understood within the framework of special relativity and general ...

  3. Temporal paradox - Wikipedia

    en.wikipedia.org/wiki/Temporal_paradox

    A temporal paradox, time paradox, or time travel paradox, is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time travel or other foreknowledge of the future. While the notion of time travel to the future complies with the current understanding of physics via relativistic time dilation, temporal ...

  4. Mental time travel - Wikipedia

    en.wikipedia.org/wiki/Mental_time_travel

    Mental time travel. In psychology, mental time travel is the capacity to mentally reconstruct personal events from the past (episodic memory) as well as to imagine possible scenarios in the future (episodic foresight /episodic future thinking). The term was coined by Thomas Suddendorf and Michael Corballis, [1] building on Endel Tulving 's work ...

  5. Quantum mechanics of time travel - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics_of_time...

    Quantum mechanics requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs), theoretical loops in spacetime that might make it possible to travel through time. [1][2][3][4] In the 1980s, Igor Novikov proposed the self-consistency principle. [5] According to this principle, any changes made by ...

  6. Physics of the Impossible - Wikipedia

    en.wikipedia.org/wiki/Physics_of_the_Impossible

    Physics of the Impossible: A Scientific Exploration Into the World of Phasers, Force Fields, Teleportation, and Time Travel is a book by theoretical physicist Michio Kaku. Kaku uses discussion of speculative technologies to introduce topics of fundamental physics to the reader. The topic of invisibility becomes a discussion on why the speed of ...

  7. Time-traveler UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Time-traveler_UFO_hypothesis

    Although traveling back in time is almost-universally considered physically impossible, theoretical research has explored whether it might be possible. [8] It has also been speculated by scientists such as J. Richard Gott, Ronald Mallet [9] and others [10] [11] that humans may someday be able to time travel to the past. [12]

  8. Hawking's time traveller party - Wikipedia

    en.wikipedia.org/wiki/Hawking's_time_traveller_party

    Coordinates: 52°12′21″N 0°7′4.7″E. Stephen Hawking in 2008. On 28 June 2009, British astrophysicist Stephen Hawking hosted a party for time travellers in the University of Cambridge. The physicist arranged for balloons, champagne, and nibbles for his guests, but did not send out the invites until the following day, after the party was ...

  9. What To Know and Do About Left Upper Quadrant (LUQ) Pain - AOL

    www.aol.com/lifestyle/know-left-upper-quadrant...

    The left upper quadrant (LUQ) is the left upper abdominal region, starting from the chest's middle line to the left side of the ribcage and down to the level of the navel (belly button). Pain in ...