According to Einstein’s theory of relativity, the faster you move, the slower time passes for you relative to others. Astronauts aboard the ISS age slightly less than people on Earth due to this time dilation effect.

Gravity affects time. Since gravity is weaker higher up, the top of your head ages just a tiny bit faster than your feet. This difference is measurable with super-precise atomic clocks.

What we consider ‘now’ isn’t universal. Because of the finite speed of light, everything you see is already in the past. Even sunlight takes around 8 minutes to reach Earth.

Due to Earth’s uneven rotation, not all minutes are created equal. That’s why we add leap seconds occasionally—to keep atomic time in sync with astronomical time.

In the vacuum of space, away from Earth's gravity, time flows quicker. This has been proven by comparing atomic clocks on satellites and on the ground.

Time didn’t exist before the Big Bang. It’s not just a measure of change but a dimension of the universe that started when space and matter began to expand.

In moments of danger, time feels slower. That’s because your brain processes more information under stress, making the event feel longer in hindsight.

Travelling into the future is supported by physics through time dilation. Backward time travel, however, is still speculative and remains in the realm of science fiction.

At the centre of a black hole—called the singularity—our current understanding of time breaks down completely. Time and space cease to function as we know them.

Today, a second is defined by the vibrations of a caesium atom—exactly 9,192,631,770 cycles. This replaced the old method based on Earth's rotation, which is slightly irregular.