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Spoo said:
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Phoenix-D said:
The speed of light is NOT always the same. You can very easily slow light down, you just can't kick it up past C.
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That's why I specified that I was refering to the speed that photons travel at. Light appears to move slowly through certain materials, but the individual photons still move at ~3x10^8m/s. In these cases what's happening is that photons are constantly being absorbed and reemitted, which makes the light appear to be moving slowly.
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True, but somewhat irrelevent..Take the extreme example: a system set up so sound travels unimpreded, but light must go through a large barrier than slows it down to below the speed of sound.
You'll now hear the blast, THEN see the shot. And this still doesn't violate cause and effect.
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Teleportation is science fiction. 
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Thank you for missing the point. And 700 years ago a weapon that could fire projectiles at greater than the speed of sound was the same thing.
The point is it doesn't matter what the observer sees first because that doesn't change the order of events.
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Wrong. "The speed of light is the same for all observers, no matter what their relative speeds."
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Which leads to some incredibly -weird- physics.
Two people are accelerating away from me, one at twice the speed of the other. I fire a laser at both. Both, if they could measure it, would see that the light is approaching at C..despite the fact that light's speed is 'constant' and one is moving faster than the other.