Some theories, most notably special and general relativity, suggest that suitable geometries of spacetime, 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 timelike curves, which are worldlines that form closed loops in spacetime, allowing objects to return to their own past. 

There are known to be solutions to the equations of general relativity that describe spacetimes which contain closed timelike curves (such as Gödel spacetime), but the physical plausibility of these solutions is uncertain.

Relativity predicts that if one were to move away from the Earth at relativistic velocities and return, more time would have passed on Earth than for the traveler, so in this sense it is accepted that relativity allows "travel into the future" (according to relativity there is no single objective answer to how much time has really passed between the departure and the return, but there is an objective answer to how much proper time has been experienced by both the Earth and the traveler, i.e., how much each has aged; see twin paradox). On the other hand, many in the scientific community believe that backwards time travel is highly unlikely. Any theory that would allow time travel would introduce potential problems of causality. The classic example of a problem involving causality is the "grandfather paradox": what if one were to go back in time and kill one's own grandfather before one's father was conceived? But some scientists believe that paradoxes can be avoided, by appealing either to the Novikov self-consistency principle or to the notion of branching parallel universes

Time Travel
Often thought to be safely in the realm of science fiction, time travel is much more real than you were led to believe. We'll unseal the evidence on time travel and let you decide for yourself if time travel is in our future, or our past.

Stargate Portals
Scientists believe that Stargates are doorways to wormholes in time. As it turns out, the government may have already known that. We'll reveal the secret location of stargates around the world and tell you who is trying to open them and why.

A NASA researcher has found hidden portals on Earth's magnetic field that open and close dozens of times each day. Some of them are open for long periods of time. 

NASA labelled these portals X-points or electron diffusion regions, they are located a few tens of thousands of kilometers from Earth. The portals are created through a process of magnetic reconnection in which lines of magnetic force from both celestial bodies mingle and criss-cross through space. The criss-crossing creates these x-points

Portals exist on this planet and off planet. NASA has been working on these portals since 1998.

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