Well, he did say it was only a theory....

[gardhr]

Nah. Probably due to an error in measurement. Wouldn't this be fairly simple to confirm or refute by, say, comparing relative fluctuations in neutrino activity originating from the direction of the sun's core and the visible appearance of solar flares, perhaps? A distance of ~90-million+ miles would more than sufficient to produce a noticable gap, methinks.

You are in a rocket ship heading along at half the speed of light. Inside your ship, control signals are flowing around as needed. Since electrical signals generally move at some significant fraction of the speed of light. Does it not strike you as entirely possible that a signal travelling from the back of the ship to the front exceeds the speed of light by quite a significant margin?

A radio signal sent from the rear to front of the vehicle would still be clocked at C, no matter what the speed or acceleration of the ship is (including 99.999999999999999999% C).

We see this effect all the time in 2 way radio communications. It's called the "Doppler Effect" where a signal from a source travelling toward you is shifted slightly higher in frequency and one travelling away is shifted lower... If you have a high velocity source (like a satellite) travelling toward you, broadcasting a signal, is the signal travelling at C*VF + Vsource? Yes it is, that's how the doppler effect works... That radio wave might well be exceeding the speed of light...

Doppler shift is a change in frequency, not propagation.

[Mario F.]

A radio signal sent from the rear to front of the vehicle would still be clocked at C, no matter what the speed or acceleration of the ship is (including 99.999999999999999999% C).

To add to that:

if I'm inside a ship moving at 100 km/h and I move from the back of the ship to the front of the ship in a car doing 20 km/h, I'm moving at 20 km/h relative to the ship and 100 km/h relative to space.

My body (and this would also be true if I was being dragged by a rope attached to the ship and tried to pull myself inside) is a part of the mass required to move the ship at 100 Km/h. Ship and occupant constitute a single body of mass.

Similarly, If I'm driving my car at 150 Km/h and my daughter reaches out from the back seat, she didn't just yanked my right arm off my shoulder at 150 km/h plus whatever speed she applied to her gentle tapping.

[gardhr]

To add to that:

if I'm inside a ship moving at 100 km/h and I move from the back of the ship to the front of the ship in a car doing 20 km/h, I'm moving at 20 km/h relative to the ship and 100 km/h relative to space.

Or rather, 80 km/h with respect to that particular reference frame (notice I didn't say "space", which implies an absolute coordinate system).

My body (and this would also be true if I was being dragged by a rope attached to the ship and tried to pull myself inside) is a part of the mass required to move the ship at 100 Km/h. Ship and occupant constitute a single body of mass.

Similarly, If I'm driving my car at 150 Km/h and my daughter reaches out from the back seat, she didn't just yanked my right arm off my shoulder at 150 km/h plus whatever speed she applied to her gentle tapping.

This has less to do with physical contact than an equivalence in velocities, though. If you and I were traveling perfectly alongside eachother, in a vacuum, windows open, travelling at say 99% C, then we could play a game of toss just as if we were stationary (and in a relativistic sense, we would be).