Tipler published a paper on how to build a time machine, a Tipler Cylinder, back in 1974. This machine would enable you to travel back in time.

Time travel has been a popular science-fiction theme since H. G. Wells wrote his celebrated novel The Time Machine in 1895. But can it really be done? Is it possible to build a machine that would ...

Astrophysicist Ron Mallett believes he's figured out how to build a time machine that would allow someone to travel to the past.

Time travel has been a popular science-fiction theme since H. G. Wells wrote his celebrated novel The Time Machine in 1895. But can it really be done? Is it possible to build a machine that would ...

According to Stephen Hawking, building a time machine isn't hard: "All you need is a wormhole, the Large Hadron Collider or a rocket that goes really, ...

Let's indulge in a little science fiction for a moment. Time travel movies often feature a vast, energy-hungry machine. The machine creates a path through the fourth dimension, a tunnel through time.