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Layman’s Artist Depiction
“Time travel is the concept of moving
between different points in time in a
manner analogous to moving
between different points in space,
either sending objects (or in some
cases just information) backwards in
time to some moment before the
present, or sending objects forward
from the present to the future without
the need to experience the
intervening period (at least not at the
normal rate).”
Source:
http://en.wikipedia.org/wiki/Time_travel
“Some theories, most notably special and general relativity, suggest that suitable
geometries of space-time, or specific types of motion in space, might allow time
travel into the past and future if these geometries or motions are possible. In
technical papers, physicists generally avoid the commonplace language of ‘moving’
or ‘traveling’ through time ('movement' normally refers only to a change in spatial
position as the time coordinate is varied), and instead discuss the possibility of
closed time-like curves, which are world-lines that form closed loops in space-time,
allowing objects to return to their own past. There are known to be solutions to the
equations of general relativity that describe space-times which contain closed timelike curves (such as Gödel space-time), but the physical plausibility of these
solutions is uncertain.”
Source: http://en.wikipedia.org/wiki/Time_travel
“The theory of general relativity does
suggest scientific grounds for thinking
backwards time travel could be possible in
certain unusual scenarios, although
arguments from semi-classical gravity
suggest that when quantum effects are
incorporated into general relativity, these
loopholes may be closed.”
Source: The Quantum Physics of Chronology Protection by Matt
Visser
“This confusing.”
Special and General Relativity state
that time passes more slowly as you
approach the speed of light. So if one
twin were to travel a very far distance at
a very high speed, he would age more
slowly relative to his twin on Earth.
When he returned home thousands of
years in the future, he would have aged
very little, while his twin would have
grown very, very old. So in this sense,
time travel is theoretically possible.
“Nice Beard, Bro.”
Wormholes are a hypothetical warped space-time
which are permitted by the Einstein field equations of
general relativity. In theory, a wormhole might allow
information to travel from one point in space-time to
another point in space-time.
Source: http://en.wikipedia.org/wiki/Time_travel
Source: http://en.wikipedia.org/wiki/Time_travel
No one knows what the future
looks like, but here’s some of the
things a time traveler can
expect:
Robots
Cyborgs
Flying Cars
Jetpacks
Aliens
A Larger Sun
A Smaller Moon
More Robots