Is it only the speed of light in a vacuum that is constant for all observers?

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Offline Bill S

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If, for example, light is travelling through a medium that reduces its speed to 0.99c, would an observer travelling in the opposite direction at 0.01c measure the speed of the approaching light as c, or 0.99c? 
There never was nothing.

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Offline QuantumClue

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Always the speed of light. The speed of light never changes, no matter what speed you move at.

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Offline QuantumClue

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Bill I must apologize. I don't believe I read the OP correctly at all, because my answer hardly fits into your question at all. Sorry about that. I take back what I said in light of it.

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Offline JP

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This is the double post that Bill was talking about.  In order to keep things tidy, I'm redirecting traffic to the livelier version of this thread:

http://www.thenakedscientists.com/forum/index.php?topic=36290.0;topicseen