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The difference that low earth orbit makes in an astronaut's life span may be negligible — better suited for jokes among siblings than actual life extension or visiting the distant future — but the dilation in time between people on Earth and GPS satellites flying through space does make a difference. Read more: Can we stop time? The Global Position...

General relativity might also provide scenarios that could allow travelers to go back in time, according to NASA(opens in new tab). But the physical reality of those time-travel methods is no piece of cake. Wormholesare theoretical "tunnels" through the fabric of space-time that could connect different moments or locations in reality to others. Als...

While Einstein's theories appear to make time travel difficult, some researchers have proposed other solutions that could allow jumps back and forth in time. These alternate theories share one major flaw: As far as scientists can tell, there's no way a person could survive the kind of gravitational pulling and pushing that each solution requires.

Astronomer Frank Tipler proposed a mechanism (sometimes known as a Tipler Cylinder(opens in new tab)) where one could take matter that is 10 times the sun's mass, then roll it into a very long, but very dense cylinder. The Anderson Institute(opens in new tab), a time travel research organization, described the cylinder as "a black hole that has pas...

Theoretical physicist Amos Ori at the Technion-Israel Institute of Technology in Haifa, Israel, proposed a model for a time machine made out of curved space-time — a donut-shaped vacuum surrounded by a sphere of normal matter. "The machine is space-time itself," Ori told Live Science(opens in new tab). "If we were to create an area with a warp like...

Time travel has long occupied a significant place in fiction. Since as early as the "Mahabharata," an ancient Sanskrit epic poem compiled around 400 B.C., humans have dreamed of warping time, Lisa Yaszek, a professor of science fiction studies at the Georgia Institute of Technology in Atlanta, told Live Science(opens in new tab). Every work of time...