Speed of light. Time actually goes slower/stop or looks like it is slower?

As you approach the speed of light (note the word approach.. you will never reach it), time ACTUALLY slows down. This is due to the idea that no matter how fast you are traveling relative to another observer, as long as you are not accelerating then all laws of physics must be the same to both observers, which includes the speed of light, a concept known as relativity, something you can't talk about Einstein without bringing it up. There is some simple thought experiments that give rise to the logic behind this idea, which you can look up yourself, but the simple answer is yes, time does indeed slow down for you relative to the other observer, it doesn't just appear to slow down.

The aspects of Einstein's theory of Relativity state that nothing can travel faster than the speed of light.

When particles are accelerated to near light speed, they will slow down. So, if a train full of passengers traveled at 99% light speed for 2 outside years, time for them would only elapse for 1.

P.S. this is time travel to the future.

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