You are currently traveling through time at a constant rate

Nature · Published 7 October 2026 Swipe more like this →

In short: While science fiction depicts humans leaping across centuries in a machine, reality offers a more subtle truth. We are constantly moving through time, but the speed of that journey is not always uniform. Depending on how fast you move or where you look, your experience of time shifts.

According to NASA's Space Place, humans typically experience time at a constant rate of one second per second. This means every person experiences the passage of time in the same way during daily life, moving from one birthday to the next. However, this 'normal' speed is subject to the laws of physics established by Albert Einstein over 100 years ago.

Einstein’s theory of relativity posits that space and time are linked together. A fundamental rule of our universe is that nothing can travel faster than the speed of light, which is approximately 186,000 miles per second. Crucially, this theory suggests that the faster an object moves through space, the slower it experiences time relative to a stationary observer.

This isn't just theoretical; scientists have proven it using synchronized clocks. In one experiment, a clock on an airplane flying in the same direction as Earth's rotation was compared to a clock remaining on the ground. The moving clock ended up slightly behind, proving that high-speed travel actually slows down time. While we cannot yet build machines to leap into the distant past or future like in movies, these relativistic effects are real enough to impact the technology we use every day.

Furthermore, we can 'travel' into the past visually. Because light takes a long time to travel across vast distances, telescopes allow us to see stars and galaxies as they existed millions of years ago. When we look at deep space, we aren't seeing the present; we are viewing a historical record of the universe.

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