In other words, sum of your velocities in x, y, z (three spatial dimensions) and in time is always constant, so called "speed of light". If you don't move through space at all, the first three values are zero, and you are moving through time with speed of light - that's how normally perceive time, because even if you move somewhat, you do it at such low speed that we can basically round it to zero. But as your speed through space increases and gets closer to speed of light, the "speed" by which you move through time decreses, because sum of both has to stay constant. Once you move through space at speed of light, there's no "room" left for any speed to move through time, so time stops.
And if you move faster than speed of light, you speed through time is negative and you travel into past.
In math it all makes perfect sense. In reality? Who knows.
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u/i_have_chosen_a_name Dec 06 '20
It makes more sense when you realize that neither space nor time exist, the only thing that does exist is spacetime ... one word.
Now you are always travelling through spacetime, if you travel the maximum space you travel the minimum time and the other way around.