A 5-year trip in space could cost 50 years on Earth.

Added: 2026-05-22

[00:00:00]What if you could travel into the future just by moving really fast?

[00:00:04]Imagine leaving Earth at age 15 in a spaceship traveling near the speed [music] of light and spending only 5 years in space.

[00:00:12]When you return, you're only 20 years old, but your friends who were once your age are now 65. [music] This strange phenomenon is called time dilation.

[00:00:21]According to Albert Einstein's theory of relativity, time [music] passes slower for objects moving close to the speed of light compared to people on Earth. So, while only a few years pass for you, decades can pass for everyone else.