Time dilation

What makes time go slower at high speed?

It feels like magic. The clock ticks slower inside of a spaceship that travels fast. Theoretically, we can travel into the future this way. But what is actually happening? Technically, what is it that makes the clock tick slower?

By reading the book A New Understanding of the Universe, you will learn the logic of why time goes slower at high speed. You will be able to see how space is linked to time.