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Time travel themes in science fiction and the media can be grouped into three categories: immutable timeline; mutable timeline; and alternate histories, as in the interacting- many-worlds interpretation. [15] [16] [17] The non-scientific term timeline is often used to refer to all physical events in history, so that where events are changed, the time traveler is described as creating a new ...
Artist's concept of the Earth 5–7.5 billion years from now, when the Sun has become a red giant. While the future cannot be predicted with certainty, present understanding in various scientific fields allows for the prediction of some far-future events, if only in the broadest outline.
The study of time travel generally follows the laws of general relativity, which describe the gravitational interactions of massive objects and the curvature of spacetime. [1] Quantum mechanics, on the other hand, requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs).
The concept of time travel by mechanical means was popularized in H. G. Wells ' 1895 story, The Time Machine. [3] [4] In general, time travel stories focus on the consequences of traveling into the past or the future. [3] [5] [6] The premise for these stories often involves changing history, either intentionally or by accident, and the ways by which altering the past changes the future and ...
The folklorist Chris Aubeck investigated the story and found it originated in a science ... a means of time travel ... time would indeed occur in this timeline.
To avoid overlap with timeline of historic inventions, the timeline does not list examples of documentation for manufactured substances and devices unless they reveal a more fundamental leap in the theoretical ideas in a field.
Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them ( special relativity ), or a difference in gravitational potential between their locations ( general relativity ). When unspecified, "time dilation" usually refers to the effect due to velocity.
In A Brief History of Time, Hawking writes in non-technical terms about the structure, origin, development and eventual fate of the Universe, which is the object of study of astronomy and modern physics.