This is too longwinded (and a Twitter thread ugh). I'll repeat an analogy I read somewhere else. Everything in the universe moves at constant speed through (fo

This is too longwinded (and a Twitter thread ugh). I'll repeat an analogy I read somewhere else. Everything in the universe moves at constant speed through (four-dimensional) spacetime. To simplify the analogy we'll just consider two dimensions: space (x-axis) and time (y-axis) with your spacetime vector being of constant length. At rest your spacetime vector is (0,1). You speed up to 10% of light speed and your spacetime vector is approximately (0.1, 9.99) so you're moving slightly slower through time. What I like about this analogy is it constrains your space vector to the speed of light. Warp Bubble Andys like to pump negative values for energy and mass into equations to rationalize something they want to be true: that faster-than-light travel is possible. To me, this is just a fundamental lack of understanding about the domain of a function. Velocity is no different. I firmly believe it's bounded by [0,c). Values outside of that range just don't make sense are as such undefined. Garbage in, garbage out.