Time travel has long been a favorite idea in science fiction. Stories about changing the past or visiting the future have ...

Imagine being able to travel to any point in time. Where would you go, and what would you do? You could witness some of the ...

A ring in space, at least on paper, can do something a black hole cannot. It can connect distant regions without forcing anything through crushing gravity or a singularity.

Physicists at MIT have created a time-reversal machine that can measure vibrating atoms. The vibrations between atoms hold a lot of information. And, if scientists can even figure out how to ...

Fans of science fiction movies and TV know that behind aliens, space travel, and robots, time travel is, by far, one of the most beloved and often employed tropes of the genre. In fact, you could ...

Have you ever made a mistake that you wish you could undo? Correcting past mistakes is one of the reasons we find the concept of time travel so fascinating. As often portrayed in science fiction, with ...

Cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed from a high-energy to low-energy environment—the Big Bang. Today, scientists believe cosmic ...

Imagine a scenario in which you visit a friend’s home and, to your shock, discover a time machine sitting in her living room. After a few jaunts to check out some dinosaurs, stir up a little trouble ...

A common theme in science-fiction media, time travel is captivating. It’s defined by the late philosopher David Lewis in his essay “The Paradoxes of Time Travel” as “[involving] a discrepancy between ...