this post was submitted on 24 Jan 2026
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You can't go faster than light because time and space are basically the same thing, and you're always moving through both of them together at a constant rate.
When you stand still, you move only through time, at the top speed of one second per second.
When you start moving through space, your speed doesn't change, only your direction. (You can visualize it as an arrow showing your speed that stays the same length, but rotates in a coordinate system from the time axis towards the perpendicular space axis.) So the faster you move through space, the slower you move through time.
At light speed, you're moving only through space. Your movement through time is zero, so time stops for you.
Going faster through space would mean going back in time, which would break causality.
To be fair, what even is "standing still"? I'm sitting in a chair in a spaceship made out of almost all the elements and water traveling around 220km/s relative to Sagittarius A.
It's always in relation to a frame of reference.
Compared to earth, you're standing still, so your time passes at the same rate as earth time.
Compared to Sagittarius A, you're moving through space, so your time passes slower than that of Sagittarius A.
Causality is overrated. I'd be ok if we broke it.
What would we replace it with? The raw chaos of the universe in its unformed state?
But Causality isn't OK with that.