3 ms·
I’m stumped by that as well. Traveling faster than the speed of sound doesn’t make you silent; it feels like time is being arbitrarily defined relative to light
by Rumudiez 8y ago
I’m stumped by that as well. Traveling faster than the speed of sound doesn’t make you silent; it feels like time is being arbitrarily defined relative to light(?)
- TeMPOraL 8y agoFrom what I remember reading about relativity, I believe the difference is that speed of sound is just an arbitrary speed of mechanical waves in the air, while speed of light (in a vacuum) is literally what defines what it means for two events to occur before/after each other or simultaneously. Unfortunately, I am confused about implications of that.
- irq 8y agoAir is a sufficiently different medium from space-time that comparing them this way is not useful.
- piyh 8y agoThe speed of light is actually the speed of causality. It just happens that since photons don't have rest mass, they always move at the speed of causality. Gluons are also massless like light, but don't exist on their own. If there's a particle that carries gravity, it would also be massless. You could say light travels at the speed of gravity.
- tomp 8y agoThis only implies that FTL transport would make causality travel a bit faster... but not subvert it (i.e. "travel through time" or "change the past").