**Before we explain this theory, you must have in mind something: **

**There are 2 postulates:**

**Objects move relative to each other. If you are in a moving car, while reading this article, then you don’t move relative to the driver, but you move relative to the ground or to the universe with a certain speed.****The speed of light is constant in the universe and in astrophysics it’s notated with ‘c’.**

**Let’s say there is you and Einstein. You both have a light Clock which has a light beam bouncing between two parallel mirrors. **

**When you both stay on Earth without moving relative to it, both light beams travel the same distance. **

**Let’s say you remain on Earth and Einstein is traveling in the space with 90% of the speed of light, Einstein’s light beam would travel much faster than yours. **

**Though this contradicts the second postulate…**

**For the both speeds of the light beam to be the same, there must be another factor**

**And that is Time. **

**So it turn out the faster you move in space, the slower time passes. You experience this thing every day, but insemnificant. Differences of some nanoseconds. **

**Here is another example:**

**There are 2 twins on Earth, one of them goes on a spaceship, traveling with 80% light speed for 1 sec in total. When he comes back, his twin will be older with some years.**

**But how can we measure this?**

**Let’s note time on Earth with Te and time in space with Ts. **

*Te = Ts / √ 1-(v^2/c^2)*

*Te = Ts / √ 1-(v^2/c^2)*

**So 1 second of space travel with 0,8 c = 1,67 seconds on Earth. **

**And this is How you can be younger than your Twin 😉**

**Hope this article was interesting for you. You can visit my other posts or share this post. **

**See you next time!**