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Please tell me, is there an instant where light is standing still.
- Tshepo Ntsala (age 27)
South Africa. Soweto
A beam of light in a vacuum will have the same velocity as measured by
an observer in any frame. So no, we will never see light stand still.
Perhaps you heard about some recent experiments in which it was
said that light trapped in a special material 'stood still' until it
was released by another light beam. You could also describe the same
experiments by saying that the material stored a sort of pattern
guiding the release of the next light pulse, instead of saying that
light itself stood still.
(republished on 07/29/06)
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