Re:Why can’t I go faster than the speed of light?
by formerly_proven on Sunday September 12, 2021 @02:42PM
(#28503640)
> Addendum: I don't understand why you said 45° instead of 90°. I thought objects traveling at the speed of light would experience infinite time dilation, and thus be observed as having 0 passage of time.
Think about what the diagram shows: Every (s[pace], t[ime]) coordinate pair on the spacetime diagram shows an observation of a particle. So in natural units, a photon's wordline is given by s=t or s=-t (traveling in one or the other direction). If you draw that, it's a 45° line. It also gives you the light cone of the observer at (0, 0).
A horizontal wordline would be something moving at infinite speed, not the speed of light, as it is observed at every place at the same time.
Think about what the diagram shows: Every (s[pace], t[ime]) coordinate pair on the spacetime diagram shows an observation of a particle. So in natural units, a photon's wordline is given by s=t or s=-t (traveling in one or the other direction). If you draw that, it's a 45° line. It also gives you the light cone of the observer at (0, 0).
A horizontal wordline would be something moving at infinite speed, not the speed of light, as it is observed at every place at the same time.