Time travel is the hypothetical activity of traveling into the
past or future. Time travel is a widely recognized concept in
philosophy and fiction , particularly science fiction . In fiction ,
time travel is typically achieved through the use of a
hypothetical device known as a time machine . It is uncertain if time travel to the past is physically
possible, and 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 well-understood within the
framework of special relativity and general relativity .
However, making one body advance or delay more than a
few milliseconds compared to another body is not feasible
with current technology. As for backward time travel, it is
possible to find solutions in general relativity that allow for
it, such as a rotating black hole. Traveling to an arbitrary
point in spacetime has very limited support in theoretical
physics , and is usually connected only with quantum
mechanics or wormholes .
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