Forward time travel, outside the usual sense of the perception of time, is an extensively observed phenomenon and is well understood within the framework of special relativity and general relativity.

Jan 20, 2026 · Einstein's theory of relativity says that space and time are linked together. Credit: NASA/JPL-Caltech. What does this mean for time travel? Well, according to this theory, the faster …

Dec 22, 2025 · Relativity time dilation shows how motion and gravity reshape the physics of time, revealing why clocks, astronauts, and satellites experience time differently in space.

May 28, 2024 · Explore Einstein's theories of Special and General Relativity, and their implications for the possibility of time travel in modern physics.

Jul 13, 2022 · Learn exactly how Einstein's theory of relativity works, and discover how there's nothing in science that says time travel is impossible.

If you look at Einstein’s equations for special relativity you might convince yourself that one way to travel backwards in time is to move faster than the speed of light.

In the Special Theory of Relativity, published in his so-called “miraculous year” of 1905, Einstein had the audacity to turn the question around and ask: what must happen to our common notions of space …

Mar 5, 2026 · The Faster You Travel, the Slower Your Time Moves In 1905, Einstein introduced special relativity, built upon a radical postulate: the speed of light in a vacuum is constant for all observers, …

However, relativity also shows that no signal can travel faster than light, which means causes must always occur before effects and true backward time travel is not possible.

Apr 6, 2025 · This isn’t just science fiction—it’s real, thanks to Einstein’s theory of relativity. When objects zip near light speed, time acts strangely, unlike what we’re used to. This phenomenon makes …