303 | AMA | February 2025

3488.34 - 3509.489 Sean Carroll

There's no such thing as a reference frame for velocity in relativity. There's no preferred velocity to the universe. So slow down compared to what? Said in other words, if there was only one object in the universe, I could always describe that object in its rest frame, in the frame in which it's not moving at all. And there it's just not moving, so there's no need for it to give off—