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In the center of stars. - (previous answer)

Light has been artificially slowed to far lower speeds

Researchers at the Rowland Institute for Science slowed light to 38 miles per hour in 1999 ( http://en.wikipedia.org/wiki/Slow_light )

[ sourced from Cromie, William J. (1999-02-18). "Physicists Slow Speed of Light". The Harvard University Gazette. http://www.hno.harvard.edu/gazette/1999/02.18/light.html. Retrieved 2008-01-26. ]

so to answer the question, light has so far been shown to travel the slowest

in a Bose-Einstein condensate

though technically since a balckhole is infinitly small and can trap light, its speed in a black hole reaches zero, but then its not really traveling is it?

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