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narrator
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I understand that the speed of light is always constant for the observer, but I keep coming across references that suggest it varies in different situations.
What situations, and what frame of reference?
I saw an interesting documentary many years ago. They talked about light moving at different speeds depending on gravitational forces. To test this, they had a plane flying at high altitude. From the ground, they shot laser pulses at it and timed the reflected response, comparing it to a laser shot across land. The experiment worked and there was cheering in the streets ;)
What situations, and what frame of reference?
I saw an interesting documentary many years ago. They talked about light moving at different speeds depending on gravitational forces. To test this, they had a plane flying at high altitude. From the ground, they shot laser pulses at it and timed the reflected response, comparing it to a laser shot across land. The experiment worked and there was cheering in the streets ;)