system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Time.

So from what I learned, time is a dimension, and so is space. We move through both. When we move through space we change our position relative to other objects in space, but how does time come into play here?  

What is the effect of time and how does it affect space? How is a rock that is standing still in space, but moving at maximum speed through time different from a rock that's moving at the speed of light and not moving through time at all?
gpt
From a scientific perspective, time is infuriating. We haven't been able to come up with a definition of time that doesn't rely on circular logic.

However, we are fairly certain that time exists, and is not just a part of our perception. The reason we believe this is because the mathematical functions that rely on time to describe other things all work out. Granted, that's not proof.

Time is essentially one-dimensional. We believe that it is possible to change the rate at which something experiences time, but strangely, it doesn't seem possible to go in the other direction. For some reason that has eluded us, it seems that the universe is compelling everything to only move *forwards* in time.