# Thread: time, speed, and stuff...

1. If speed is distance over time, and time stops at the speed of light, does light actually travel? It seems like if you arrive somewhere at the same time you left somewhere else, you didn't actually travel. And if light doesn't travel, does distance equal time?

2.

3. If we don’t change direction soon, we’ll end up where we’re going.

time, speed, and stuff...

BTW, I'm more interested in the "stuff". Is it good stuff?

4. Time does not "stop" at the speed of light. There is no way to construct a frame for observations taken while moving at the speed of light. Attempts yield terms looking like x / 0 all over the place, and x / 0 does not exist for any x, even in the form of a limit -- really. Light itself has the same speed in any reference frame, and so there is no frame in which light has speed 0. More compactly, light does not have a rest frame. So discussions of the implications of things happening in a frame moving along with a photon yield undefined results. It is best not to worry about them.

5. Originally Posted by mvb
Time does not "stop" at the speed of light. There is no way to construct a frame for observations taken while moving at the speed of light. Attempts yield terms looking like x / 0 all over the place, and x / 0 does not exist for any x, even in the form of a limit -- really. Light itself has the same speed in any reference frame, and so there is no frame in which light has speed 0. More compactly, light does not have a rest frame. So discussions of the implications of things happening in a frame moving along with a photon yield undefined results. It is best not to worry about them.
I've read about an alternate theory of light that claims if you accelerate photons you don't get more speed but you do get more warped space. It's interesting to me, but my math skills are not up to the task of saying one way or the other. I do know there's a lot more to light than we can even guess at in our present time.

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